Diamonds: Timeless but Worthless

A deep-dive into how laboratory-grown diamonds are transforming the gemstone industry from a luxury asset into an energy commodity

Introduction

There is perhaps no greater marketing triumph in modern commercial history than the diamond. A stone of compressed carbon, abundant enough to be found on every continent, was transformed into the universal symbol of love, commitment, and wealth, and held at that price for over a century through an act of deliberate supply manipulation so brazen it would today constitute antitrust violations in most democracies. De Beers' 1947 slogan "A Diamond Is Forever" was not a geological fact; it was a business strategy. It convinced generations of consumers to equate the hardness of carbon with the durability of love, and to resist reselling stones that, if they re-entered the market, would expose the truth: diamonds were never scarce.

That illusion is now collapsing.

Laboratory-grown diamonds (LGDs), physically, chemically, and optically identical to mined stones, can now be purchased polished and certified for under $200 per carat on wholesale platforms [BriteCo, 2025; Liori Diamonds, 2026]. The cost of producing a 1-carat stone has fallen from approximately $4,000 per carat in 2008 to $200–300 per carat by 2026, with some analyses placing manufacturing floor costs as low as $12–50 per carat once energy is subsidized [Draco Diamond, 2024; FCRF, 2023]. Fancy colours, pink, blue, yellow, red, green, previously considered either impossible to create in a laboratory or commercially unviable, are now routinely grown and retailed.

This paper examines the science behind diamond synthesis, the economics of energy-driven production, the collapse of fancy-colour premiums, the automation of cutting and polishing, and the market trajectory that will make diamonds, in all colours and sizes, more comparable to industrial ceramics than to precious metals within two decades. It concludes with a personal note on Diam Concept, a pioneering French CVD laboratory that exemplified both the promise and the structural impossibility of high-end diamond synthesis in a high-cost European economy.

"A diamond is just a lump of coal that did well under pressure." , Popular attribution, origin disputed

"Lab-grown diamonds are real diamonds, the FTC confirmed it in 2018. The only thing fake about them is the price." , Paul Zimnisky, Diamond Industry Analyst [IDEX, 2024]

1. Science of Diamond Formation and Synthesis

1.1 Natural Formation

Natural diamonds crystallise in the Earth's lithospheric mantle, typically 140–190 km below the surface, at pressures of 45–60 kilobars (4.5–6 GPa) and temperatures between 900–1,300°C [GIA, 2024]. The process takes billions of years. Nitrogen impurities and lattice vacancies are the primary source of colour: nitrogen in specific aggregation states produces yellow and orange tones, while structural vacancies and hydrogen produce pink, red, and brown hues. Boron substitution creates the rare Type IIb blue diamond. Green diamonds generally result from natural irradiation near the surface. These are not exotic chemistry, they are well-understood physics, and they can be replicated.

1.2 High-Pressure High-Temperature (HPHT) Synthesis

The first synthetic gem-quality diamonds were produced in 1954–1955 by General Electric using the HPHT method. Modern HPHT presses, belt-type, cubic multi-anvil, and split-sphere designs, place a carbon source (typically graphite) and a metallic flux (iron, nickel, or cobalt) in a reaction cell subjected to 5–6 GPa and 1,300–1,600°C [GIA, 2024]. A diamond seed crystal at a slightly cooler temperature acts as a template; carbon dissolves in the molten metal and precipitates onto the seed.

How it works, step by step:

1. A diamond seed and graphite carbon source are encased with metal flux in a reaction capsule
2. The capsule is loaded into a multi-anvil press capable of generating several GPa
3. Resistance heating raises the temperature asymmetrically, warmer at the carbon source, cooler at the seed
4. Carbon supersaturates in the flux and migrates toward the seed, crystallizing as diamond
5. Growth proceeds at 5–10 mg/hour, producing a 1-carat crystal in approximately 3–5 days
6. The crystal is extracted and the metallic inclusions are acid-etched away

HPHT excels at producing colourless and yellow diamonds at low cost. Its weakness is metallic inclusions and colour zoning. It dominates Chinese production: companies such as Zhengzhou Sino-Crystal Diamond, Zhongnan Diamond, and Henan Huanghe Whirlwind collectively account for the majority of the world's HPHT output, primarily in small melee sizes for paving and industrial use [GIA, 2024]. China produced approximately 3 million carats of HPHT diamonds in 2023 [GIA, 2024].

Typical HPHT energy consumption: 175–225 kWh per rough carat for single-stone presses; 75–150 kWh per rough carat for multi-stone configurations [JCK, 2019].

1.3 Chemical Vapour Deposition (CVD) Synthesis

CVD takes a radically different approach. Rather than simulating the conditions of the Earth's mantle, CVD mimics a process found naturally in interstellar space: carbon-rich gas plasma depositing diamond layer-by-layer onto a substrate. It requires no extreme pressure.

How CVD works:

1. A diamond seed plate (often sliced from a previous CVD or HPHT crystal) is placed in a vacuum chamber
2. A mixture of methane (CH₄, typically 1–5%) and hydrogen (H₂) is introduced at pressures of 1–30 kPa
3. Microwave or radio-frequency energy (2.45 GHz is standard) ionises the gas, creating a plasma at 900–1,200°C
4. Hydrogen radicals etch away non-diamond carbon (graphite, amorphous carbon), while carbon atoms deposit selectively onto the diamond lattice
5. The diamond grows layer by layer at 1–20 µm per hour
6. A 1-carat rough crystal of appropriate thickness typically requires 2–4 weeks of growth
7. The crystal is often brown ("as-grown CVD") due to nitrogen and vacancy complexes; post-growth HPHT annealing at ~2,000°C removes these defects and upgrades colour to colourless or near-colourless

Diam Concept, the French laboratory discussed in the Personal Note, used microwave plasma CVD reactors, specifically designed by founder Alix Gicquel, who had led France's first plasma-for-diamond-growth research team since 1990 [Diam Concept, 2023; JCK, 2024]. This architecture uses a resonant microwave cavity to generate extremely stable, high-power plasma, enabling growth of large, high-purity single-crystal plates.

Typical CVD energy consumption: 60–120 kWh per rough carat for the growth phase; rising to 1,000–1,700 kWh per polished carat when accounting for the lower conversion yield from CVD rough [JCK, 2019].

India leads CVD production: Surat in Gujarat hosts an estimated 4,000–6,000 CVD reactors, and in May 2024, an Indian company displayed the largest known faceted CVD diamond to date, a 75.33-carat square emerald cut, at JCK Las Vegas. Its crystal reportedly took nine months to grow [GIA, 2024].

1.4 Colour Control: The Chemistry of Fancy Diamonds

This is perhaps the most misunderstood aspect of laboratory diamonds, and the area with the most immediate financial implications for the market.

The pink diamond myth deserves special attention. For decades, the industry claimed pink diamonds were impossible to grow in a laboratory because their colour mechanism, believed to involve plastic deformation of the crystal lattice during volcanic eruption, could not be replicated. The closure of Australia's Argyle mine in 2020 (which produced 90% of the world's pink diamonds) was used to justify price premiums exceeding $1 million per carat for vivid pink naturals.

This is now obsolete. By precisely engineering nitrogen-vacancy (N-V) colour centres during CVD growth, then treating them with HPHT annealing at specific temperatures and pressures, laboratories produce pink to vivid red diamonds reproducibly. In September 2023, Element Six and De Beers' Lightbox brand produced CVD diamonds with nitrogen vacancies that yield pink colour [NextMSC, 2025]. The Gemological Institute of America confirms that laboratory-grown pink diamonds now appear regularly in grading submissions [GIA, 2024].

The colour of a laboratory diamond is, fundamentally, a recipe, a controlled introduction of specific impurities at specific concentrations. From the standpoint of manufacturing cost, there is no dramatic difference between growing a colourless diamond and a pink one: the variable is process gas composition, post-growth treatment, and irradiation dose. The notion that a pink laboratory diamond should cost materially more than a white one is more about retail margin strategy than manufacturing reality.

2. Global Market: From Cartel to Commodity

2.1 Natural Diamond Industry

The global natural diamond market was valued at approximately US$102 billion in 2025 and is projected to reach US$153 billion by 2034 (CAGR 4.6%) [Expert Network Calls, Feb 2026]. This valuation, however, rests heavily on perception rather than intrinsic scarcity. Production is concentrated in Russia (Alrosa), Botswana (Debswana/De Beers), Angola, Canada, and South Africa.

De Beers historically controlled up to 90% of global rough supply through its Central Selling Organisation, deliberately stockpiling excess rough and restricting releases to maintain price floors [GIA, 2020]. That model has cracked: Alrosa's rise, consumer awareness, ESG pressures, and the emergence of lab-grown diamonds have forced De Beers into a defensive position. Its own response, launching the Lightbox lab-grown brand in 2018 at deliberately flat retail prices ($800/carat regardless of size), was a transparent attempt to reframe LGDs as cheap fashion items while preserving the "natural = premium" narrative. The strategy has had mixed results.

Natural diamond prices have been declining since 2022. The Rapaport Diamond Report, the industry's pricing benchmark, showed a 20–25% drop in natural rough and polished prices in 2023 alone, partly due to market saturation, partly due to sanctions on Russian rough (Alrosa accounts for ~30% of global supply), and partly due to lab-grown competition. Natural diamonds are no longer a safe-haven asset. Unlike gold, which is fungible, liquid, globally traded, and has intrinsic industrial demand, diamonds are illiquid: the spread between retail purchase price and resale value can exceed 50–70% the moment you leave the store.

2.2 Lab-Grown Diamond Market

The LGD market grew from near-zero to mainstream acceptance in under a decade. Key figures for 2024–2025:

• Global LGD market: US$27–29 billion (2024–2025), growing at 11–14% CAGR [Precedence Research, 2026; UniVDatos, 2025]
• Projected 2034: US$91–108 billion [Fortune Business Insights; Precedence Research]
• US engagement rings with LGD center stones: ~47–52% of sales in 2024 [BriteCo, 2025; Liori Diamonds, 2026]
• Average size of LGD engagement ring center stone: grew from 1.31 carats in 2019 to 2.45 carats in 2025, an 87% increase [BriteCo, 2025]
• LGD price per carat: fell from ~$3,410 (1ct, January 2020) to ~$747–1,000 (2025–2026) [Liori Diamonds, 2026; BriteCo, 2025]

The collapse in wholesale prices is even more dramatic. Washington Diamond reports that in 2026, a wholesale 3-carat D/VVS round has a wholesale index price of approximately $180 per carat [Washington Diamond, 2026], while some retailers continue to list the same stone at $3,000–5,000, representing markups of 10–17× the cost of goods.

This is the dirty secret of the LGD jewelry business: the stone itself approaches commodity pricing, but retail margins remain at luxury-goods levels. That arbitrage window is closing.

2.3 Regional Market Distribution (2024)

2.4 Price Trajectory: The Numbers That Should Terrify the Trade

The data below reflects verified market data and reasonable near-term projections:

2.5 The Alibaba Reality: What a Diamond Actually Costs, and Why That IS the Retail Price

One of the most important things to understand about the modern lab-grown diamond market is this: Alibaba is not wholesale. It is retail.

The minimum order on the listings documented here is 1 carat, meaning 1 stone. There is no bulk purchase requirement, no business registration needed, no gatekeeper. Any person with an internet connection and a credit card can order a single 1-carat D/VVS2/Excellent CVD diamond and have it delivered. That is the definition of retail.

In April 2026, verified Alibaba listings showed:

• 1 carat: €119.03, D colour, VVS2 clarity, Excellent cut, CVD/HPHT
• 1.5 carat: ~€178
• 2 carat: ~€238
• 3 carat: €390.30

The near-perfect linearity, €119/ct at 1 carat, €130/ct at 3 carats, is direct confirmation that laboratory diamond pricing scales with energy and time, nothing else. (See Figure 9.)

For melee diamonds, what the trade calls "pointers," the tiny stones used in pave and halo settings, the commoditisation is even more complete. These are listed not by carat weight but by diameter in millimetres, because at this scale carat weight has become commercially irrelevant. Minimum order: 1 carat (~150 stones). Prices from the same listing, DEF/VVS–SI quality:

• 0.80 mm: €2.26 per stone
• 1.00 mm: €3.51 per stone
• 3.00 mm: €33.48 per stone
• 3.20 mm: €35.36 per stone

So why does a platform like Brilliant Earth or James Allen charge €700–1,800 for the same 1-carat stone? Why does a high-street jeweller charge €1,000–2,000 for a loose stone and call it a deal?

The honest answer: they are charging for the consumer's ignorance. That markup made sense in 2000, when diamond pricing was opaque, sourcing required industry contacts, and the consumer had no way to compare. In 2026, with Alibaba's minimum order at 1 stone and global shipping in a week, that information asymmetry no longer exists. The markup is not a service. It is a legacy exploiting the fact that most buyers have not looked.

The only legitimate premium on a loose lab-grown stone today is IGI or GIA certification (€30–50) and shipping/insurance (€10–20). Everything beyond €160 on a 1-carat D/VVS2 is margin. The markup becomes legitimate only when a jeweller is setting the stone into a custom piece, providing craftsmanship and after-sales service, but that is the setting, not the stone, and should be priced transparently as such. (See Figure 7.)

Table A: 1-Carat Round Brilliant Diamond, Price Comparison Across Time

Table B: Price by Carat Weight, Lab-Grown vs Natural (2025–2026)

Sources: Karaters 2025; Washington Diamond 2026; Mikado Diamonds; Angara 2025

3. Fancy Colours: The Final Price Illusion

3.1 The Natural Fancy Colour Market, and Its Structural Vulnerability

Fancy colour natural diamonds, pink, blue, red, orange, green, have historically commanded astronomical premiums. The Graff Vivid Yellow (100.9 carats) sold for $16.3 million in 2020 [IGS, 2025]. A 1-carat Fancy Vivid Pink natural diamond has traded above $1 million per carat at auction. A natural blue like the 45.52-carat Hope Diamond is essentially priceless.

The justification: extreme geological rarity. Fancy coloured diamonds represent fewer than 0.1% of all diamonds mined globally [IGS, 2025]. Pink diamonds specifically constituted an estimated 0.001% of global production even before the closure of Argyle [FCRF, 2025].

These prices were not purely market-driven, they were also a function of narrative control. Major dealers, auction houses (Christie's, Sotheby's, Bonhams), and mining companies have a vested interest in maintaining the mythology of rarity.

That mythology is now technologically falsified.

3.2 Fancy Colour Lab-Grown Diamonds, Price Comparison

Table C: Natural vs. Lab-Grown Fancy Colour Diamonds (2025, per carat, 1 ct)

These figures illustrate a brutal economic reality: the cost of manufacturing a lab-grown blue or pink diamond is essentially the same as manufacturing a colourless one. The variable is post-growth treatment complexity, not raw material cost. A CVD reactor does not know whether it is making a D-colour white diamond or a pink one, the recipe differs slightly, but the energy input is comparable.

This means that as market awareness grows, the enormous natural fancy-colour premiums will compress. The Fancy Color Research Foundation (FCRF) already documented a 0.3% decline in its Q1 2025 fancy colour index, a small move, but one that represents a directional shift after decades of appreciation [CaratX, 2025].

The Argyle mine closure (November 2020) initially drove pink diamond prices sharply higher, as dealers predicted that natural supply would plummet. What the market underestimated was the pace of laboratory capacity expansion. The absence of Argyle has not made pink diamonds rarer in commercial terms, it has accelerated investment in laboratory alternatives.

4. The Mathematics of a Diamond: Energy, Capital, and Labour

4.1 What a Diamond Actually Costs to Make

The price of a diamond should, in a rational market, approximate its cost of production plus a reasonable margin. For laboratory diamonds, production cost breaks down into three components:

1. Energy CVD reactors are electricity-intensive. A microwave plasma reactor drawing 5–10 kW running for 200–500 hours to grow a 1-carat crystal consumes approximately 1,000–5,000 Wh per growth run in the reactor alone. Including gas handling, vacuum systems, annealing, and facility overhead, the JCK (2019) analysis puts CVD polished carat energy at 1,000–1,700 kWh. At Chinese industrial electricity rates of US$0.08–0.10/kWh, this equates to $80–170 per polished carat in energy costs.

2. Capital / Amortisation A high-end CVD reactor (e.g., a 915 MHz microwave plasma reactor) costs approximately $300,000–800,000 new. Assuming a 20-year lifespan, throughput of 500 carats per year, and no residual value, amortisation is approximately $30–80 per carat. In China and India, reactor costs have fallen dramatically due to local manufacturing of press and reactor components: HPHT multi-anvil presses can now be sourced domestically at a fraction of Western equipment costs.

3. Labour and Cutting/Polishing Polishing in Surat costs approximately $10–40 per carat for standard rounds; fancy cuts (hearts, marquises, custom shapes) command $20–80 per carat due to planning complexity and material loss. AI-optimised cutting, laser sawing, and robotic polishing are reducing these costs further, see Section 6.

Table D: Estimated Total Production Cost per Polished Carat (2025)

Sources: JCK 2019; Africa Data Hub 2026; Cubeconcepts 2024; US Chamber of Commerce 2024; Author calculations

This table explains why Diam Concept went into receivership in France: producing a carat of polished diamond at French electricity rates (~$0.187/kWh industrial), French labour costs, and with state-of-the-art equipment was inherently uncompetitive against Chinese and Indian producers whose total costs were 2–4× lower.

4.2 Energy Cost by Electricity Price

Table E: Energy Cost per Polished Carat at Different Electricity Prices (1,200 kWh assumed)

The cheapest theoretically achievable energy cost, at Ethiopia's subsidised hydro rate, would be under $4 per carat in electricity alone. This is why the industry's long-term cost floor is approaching $30–50 per carat total in competitive locations.

4.3 The 20-Year Machine Argument

A well-maintained CVD reactor or HPHT press does not wear out in five years, manufacturers routinely operate equipment for 15–25 years with component replacement. This means that amortisation, the second-largest cost component, continues to decline on a per-carat basis as installed equipment ages. Facilities built today at a capital cost of $500/carat-capacity per year will see that burden halve by year 10 and nearly vanish by year 20.

The implication: in mature markets, the true marginal cost of growing a diamond will be approximately energy + consumables + labour, perhaps $30–80 per carat in competitive locations. The idea that a polished 1-carat diamond should retail for $1,000 in 2026 already reflects enormous markup; the idea that it should retail for $4,000–6,000 as a natural stone is increasingly difficult to justify on any grounds other than brand management.

5. Popular Shapes: What the Market Buys and What It Costs

Table F: Popular Diamond Shapes, Characteristics and 2025 Lab-Grown Retail Pricing (1 ct, G/VS2)

Sources: Roman Malakov 2023; BriteCo 2025; Karaters 2025

A key observation: the emerald cut is particularly well-suited to CVD production. CVD crystals grow as flat plates (tabular morphology), and emerald cuts preserve more of this geometry than rounds, which require sacrificing significant material to achieve the crown. Lab-grown producers are increasingly optimising reactor geometry to grow crystals that minimise waste when cut into popular fancy shapes.

6. Cutting, Polishing and the Coming Automation Wave

6.1 Current State

Surat, India processes over 90% of the world's diamonds by volume [AIDI, 2026; Robotics & Automation News, 2025], employing an estimated 500,000 workers. The process is intricate:

1. Planning: A gemologist or AI system analyses the rough using 3D scanning to map inclusions and determine the optimal cut that maximises value (carat weight × clarity × colour grade × shape premium)
2. Marking: The cut plan is marked on the rough using lasers or ink
3. Cleaving / Sawing: Large stones are split along crystal planes; modern facilities use laser sawing for precision
4. Bruting: The stone's girdle (equator) is shaped by spinning two rough diamonds against each other, or by laser
5. Faceting / Brillianteering: Individual facets are ground and polished on cast-iron scaifs (wheels) impregnated with diamond powder
6. Final polishing: Ultra-fine polishing to achieve maximum reflectance
7. Grading: Quality control and GIA/IGI submission

Each step was historically performed by skilled artisans. Surat's workforce has developed generational expertise, a master polisher can "feel" how a stone is responding and adjust pressure instinctively. This knowledge, accumulated over decades, is now being encoded into machine-learning systems.

6.2 The AI and Robotics Transformation

The transformation now underway in Surat is, arguably, the final nail in the coffin of diamond value mythology. If the stone can be grown by a machine and cut by a machine, the "craft" premium that has always justified diamond pricing disappears.

Key developments:

• AI-optimised cut planning: Systems analyse diamond rough in minutes and generate cutting plans that historically required hours of expert analysis. GIA now employs AI grading systems processing over 40 million data points per diamond [Labrilliante, 2025]
• Robotic sawing: STPL's RoboCut and RoboCut Pro can saw 50 diamonds simultaneously using laser-guided automation, achieving consistent yield optimisation [STPL, 2022; Future of Diamond Processing]
• The Fenix system: Developed at the Scientific and Technical Research Center for Diamonds in Antwerp, later acquired by HD Blueprint, this robotic cutter operates 10–20× faster than human artisans [Robotics & Automation News, 2025]
• Automated polishing: Robotic arms with advanced sensors and feedback mechanisms polish diamonds to preset specifications, operating 24/7 without fatigue errors [AIDI, 2026]
• Machine vision QC: High-resolution AI vision systems detect inclusions and surface imperfections invisible to the human eye [AIDI, 2026]

For CVD-grown diamonds specifically, automation offers an additional advantage: because crystals are grown in predictable tabular geometry, the AI planning step is simplified, the crystal's external form is largely known before it enters the cutting workflow. This makes robotic cutting even more efficient for LGDs than for irregularly shaped natural rough.

Projection: Within 10–15 years, a significant portion of standard-shape, sub-3-carat diamond cutting will be fully automated. Labour costs in the midstream, currently $10–40 per carat, will fall toward $2–5 per carat for routine shapes. Fancy cuts and very large stones will retain a skilled-labour component longer due to their complexity.

The analogy to watchmaking is instructive: the mass watch market was fully automated by the 1970s; ultra-luxury mechanical watches retain handcraft premiums. Diamonds are heading for a similar bifurcation, commodity-grade automation for the volume market, artisanal handcraft for ultra-high-end natural stones.

7. Diamonds as a Store of Value: The Illusion Evaporating

Gold, the other quintessential "safe haven" asset, has several properties that diamonds lack:

Lab-grown diamonds typically lose 60–80% of their value immediately after purchase and continue declining 15–20% annually as production costs decrease [Esdomera, 2025]. Natural diamonds fare better but are not immune: the natural diamond market declined 20–25% in polished prices in 2023 alone.

The fundamental problem for natural diamonds as a store of value is that their price is not anchored to anything intrinsic, it is anchored to a narrative, and narratives can collapse suddenly. The transition from "diamonds are rare and eternal" to "diamonds are manufactured carbon" is already underway in consumer consciousness, particularly among millennials and Gen Z who research purchases extensively online before buying.

8. Ethical and Environmental Considerations

8.1 Conflict Diamonds

The Kimberley Process Certification Scheme (KPCS), adopted in 2003, unites 86 countries representing 99.8% of global production to exclude "conflict diamonds" from international trade [Kimberley Process, 2025]. However, IMPACT and other civil society organisations have documented structural failures: the KPCS definition covers only rebel-group conflicts, excluding state violence, forced labour, and other abuses. Only two situations have been formally designated as "conflict zones" under the scheme [IMPACT, 2025].

Lab-grown diamonds are inherently conflict-free and require no Kimberley certification. This is a genuine, material advantage.

8.2 Carbon Footprint

The environmental calculation is more nuanced. Mining produces 125 kg CO₂ per carat on average; lab-grown production using the global average energy mix produces approximately 72 kg CO₂ per carat [Esdomera, 2025]. However, most lab diamonds are produced in China and India on coal-heavy grids, in those conditions, LGD production may approach or exceed mining's footprint [FCRF, 2023]. Renewable-powered CVD production, however, could reduce emissions to near zero.

The ethical advantage of lab-grown diamonds is not automatic, it is conditional on energy source. A CVD diamond grown in France (where 70% of electricity is nuclear) or Ethiopia (hydroelectric) has a dramatically better environmental profile than one grown in coal-powered Surat.

9. Outlook: The Commodity Future

9.1 Where Prices Are Going

The laboratory diamond market is following a trajectory familiar to anyone who has watched photovoltaic panels, LED lighting, or lithium-ion batteries: rapid cost decline as technology matures and production scales. The key variables are:

• Electricity prices: Continued growth of renewable energy reduces the input cost floor
• Reactor efficiency: Faster growth rates (already improved 40% by AI-optimised CVD [Labrilliante, 2025]) reduce time-per-carat
• Equipment amortisation: Reactor costs declining as Chinese manufacturers flood the equipment market
• Cutting automation: Robotic cutting further compresses midstream costs
• Scale: India's 4,000–6,000 CVD reactors are just the beginning; capacity is expanding rapidly

Price projection for 1-carat polished LGD (D/VS2 round, retail):

• 2026: $600–1,000
• 2028: $300–600
• 2030: $150–300
• 2035: $50–150

These are conservative estimates assuming no breakthrough technologies. Quantum-enhanced CVD reactors, developed at MIT using quantum sensors for real-time growth monitoring [Labrilliante, 2025], could accelerate this curve.

9.2 The Market Bifurcation

The diamond industry is likely to bifurcate into two permanently distinct markets:

1. Commodity diamonds (lab-grown): Traded on wholesale indices, priced per carat at near-production-cost plus a declining margin. Used for engagement rings, fashion jewellery, and increasingly as costume jewellery as prices fall below $100/carat retail. Differentiated by cut quality, not origin.

2. Collector natural diamonds: Ultra-rare, large (10+ carats), exceptional colour and clarity, with documented provenance and geological certification. These will command premiums, as art does, but purely as collectibles or status goods, not as stores of value.

The mass market will choose lab-grown. The question is only how fast the transition completes.

Personal Note: Diam Concept and the Lesson of European Diamond Manufacturing

When I began researching the laboratory diamond industry several years ago, I became involved with a group of investors exploring the acquisition of Diam Concept, a French laboratory-grown diamond company that had gone into receivership in May 2024 [JCK, July 2024].

The story of Diam Concept is instructive, both as a cautionary tale and as a proof of concept.

Founded in May 2016 by Alix Gicquel, a professor and internationally recognised scientist, Diam Concept was built on over three decades of plasma physics research. Gicquel had created France's first research team studying "diamond growth by plasma" in 1990, subsequently publishing more than 170 scientific articles and holding 8 patents. Her approach was not commodity production, it was haute couture CVD: she designed custom plasma reactors to study and control diamond growth, using microwave resonant cavity technology to generate plasma akin to the Northern Lights in a bottle.

The company specialised in D, E and F-colour white diamonds and a range of coloured stones, champagne, cognac, green, blue, pink, yellow, orange and red. This was a remarkable achievement: producing the full spectrum of fancy colours through CVD at commercial scale, including colours that the industry had claimed were impossible in a laboratory.

In 2020, Diam Concept raised 5.2 million euros from an impressive list of investors including luxury brand Chanel, Mirabaud Private Capital headed by Chanel heir David Wertheimer, and French venture capital firms IncubAlliance and the Luxury Tech Fund. The trajectory seemed promising: luxury backing, world-class science, differentiated product.

But the structural economics were immovable. The Paris-based business posted a $700,000 loss in 2022, and went into receivership in May. Chanel, which had also invested in Paris-based lab-grown jeweller Courbet, withdrew support.

When my investor group examined the acquisition opportunity, the fundamental problem was clear: it was not a technology problem. Gicquel's science was sound, the diamonds were of exceptional quality, and the fancy-colour capabilities were genuinely state-of-the-art. One of Diam Concept's key technical differentiations was its ability to produce large-area CVD diamond plates, a consequence of Gicquel's reactor design expertise, which focused on generating high-power-density plasma over extended areas to enable uniform growth on large substrates. The academic literature from her group (Silva, Hassouni, Bonnin, Gicquel, J. Phys.: Condens. Matter, 2009) specifically addresses scaling plasma reactors for large-area homogeneous diamond deposition, a capability that is extremely valuable for industrial applications such as semiconductor substrates, quantum devices, and optical windows, but which commands no premium in the jewellery market. The exact dimensions of the plates produced are not publicly documented, but the technology represented a genuine advance over standard gem-scale CVD reactors.

The problem was arithmetic:

• French industrial electricity: ~€0.187/kWh → energy cost ~$180–220 per polished carat
• French minimum wage + skilled technical labour: €30,000–80,000/year per researcher/technician
• Reactor amortisation on cutting-edge custom equipment: significant
• Total cost of goods: estimated €300–500 per polished carat

Against this, Chinese HPHT producers were offering 1-carat D-colour rounds on Alibaba at under $200 wholesale, and that price was falling. The business case for producing jewellery-grade diamonds in France, at French costs, was simply not there. Both bidders who submitted takeover offers intended to jettison the jewellery business and focus on technological applications for synthetic diamonds.

This is the only viable path for high-cost Western CVD production: not jewellery, but quantum devices, semiconductor substrates, and optical windows, where the value of the material is defined by its physical perfection and large area rather than its weight in carats. A single CVD plate optimised for nitrogen-vacancy quantum sensing, or a large-area substrate for power electronics, may be worth $10,000–100,000, not as a gemstone, but as a precision material requiring the exact capabilities Diam Concept had developed. Our investor group reached this conclusion during due diligence: the jewellery market was structurally unwinnable at French costs, but the industrial diamond market, where buyers pay for purity, homogeneity, and plate size rather than colour grade, represented a defensible niche. The irony is that the same technology that made Diam Concept uncompetitive in jewellery made it potentially extremely valuable in industrial applications: ultra-pure, large-area, defect-controlled CVD diamond is precisely what the semiconductor and quantum sensing industries need, and cannot easily source from Chinese commodity producers whose HPHT output is optimised for small gem-size stones. That industrial pivot was the thesis, ultimately, the receivership process did not allow time for it to be tested.

What the Diam Concept story confirmed for me was that the laboratory diamond industry's future belongs to whoever controls the energy equation. Alix Gicquel had the best technology in Europe. What she didn't have was cheap electricity. Her 30-year research programme, the most sophisticated CVD diamond science in France, was ultimately defeated not by science but by the electricity bill.

The same outcome has played out in the United States: WD Lab Grown Diamonds, once one of the largest and most acclaimed CVD producers in America, holder of exclusive global licenses from the Carnegie Institution of Washington, filed for Chapter 7 bankruptcy in October 2023 [Rapaport, 2023]. WD Lab Grown Diamonds had set numerous industry benchmarks, including two record-breaking achievements for big sizes of CVD laboratory-grown diamonds, and was renowned for producing as-grown high colour grades (D-E-F) without post-growth treatment, a genuinely differentiated technical achievement. It was not enough.

Diamond analyst Paul Zimnisky predicted a "shakeout" of lab-grown diamond producers in 2023 [The GemAC, 2023]. That shakeout is not over. Western producers with high energy and labour costs will continue to struggle unless they pivot to industrial and quantum applications. The jewellery market belongs to Asia.

Conclusion: Carbon, Energy, and the End of Mythology

Diamonds are becoming what they always were: crystallised carbon, worth what it costs to make them plus a margin.

The century-long premium attached to diamonds rested on three pillars: controlled supply, marketing mystique, and consumer ignorance. All three are eroding simultaneously. Lab-grown diamonds have broken the supply monopoly; the internet has dissolved the marketing mystique; and a generation of consumers who research everything online before purchasing is acquiring rapid awareness of the lab-grown alternative.

The transition will not be instantaneous. Natural diamonds will retain a premium, possibly a substantial one, among buyers who specifically value geological origin, provenance, and the collector's market for exceptional stones. An Argyle pink of impeccable provenance will always command a premium over a laboratory pink, just as an original Picasso commands a premium over a perfect reproduction. The question is whether the reproduction is good enough for most purposes, and for most buyers, it already is.

What is certain is that diamonds' role as a store of value, a safe-haven asset, a transferable repository of wealth, is over. Unlike gold, they are not liquid, not fungible, not transparently priced, and not insulated from production cost deflation. A diamond bought today at $1,000/carat will likely be worth $200–300/carat in ten years, and $50–100/carat in twenty. Its brilliance will not diminish; its monetary value will.

The industry knows this, even if it will not say so publicly. De Beers' defensive Lightbox launch, the pivot of both Diam Concept acquirers to industrial applications, the collapse of WD Lab Grown Diamonds despite exceptional technology, these are not anomalies. They are the early signals of a commodity market finding its floor.

That floor is an electricity bill. And electricity is getting cheaper.

Tables Summary

(See Tables A–F above in the body of the article)

References (MLA Style with Inline Citation Keys)

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