The diamond industry has divided substantively, beginning around 2018 and intensifying through the early 2020s, on the question of how to position lab-grown (synthetic) diamonds relative to natural diamonds in the consumer market. The split runs through every level of the trade, from De Beers and the major mining companies, through dealers and cutters, to retail jewellers and consumer-facing brands, and the resolution remains unsettled. The questions at issue, the alignments that have emerged, and the data behind both positions are central to understanding the contemporary diamond trade.

Background

Synthetic diamond production has existed at industrial scale since the 1955 GE diamond synthesis programme, with the great majority of synthetic diamond used industrially rather than gemmologically. Gem-quality synthetic diamond production became commercially significant only from the early 2010s onward, as chemical vapour deposition (CVD) and improved high-pressure high-temperature (HPHT) processes enabled the production of single-crystal gem-quality stones at scale and at progressively lower costs. By the late 2010s, lab-grown diamonds had become a meaningful share of the diamond jewellery market, particularly in the United States, where consumer acceptance and retail penetration moved faster than in most other markets.

The pricing trajectory has been the central commercial fact. Lab-grown diamond wholesale prices declined sharply between 2018 and 2024, with the polished prices for many sizes and qualities falling by 70 to 90 percent over the period as production capacity (particularly Chinese CVD output) expanded. The decline has placed sustained downward pressure on natural diamond prices in the categories where consumer substitution between natural and lab-grown is most active, particularly the bridal and gift-jewellery segment between 0.5 and 3 carats.

The two positions

The diamond trade has divided broadly into two positions:

The differentiation position, advocated most prominently by De Beers (until its 2024 strategic shift), Diamond Producers Association / Natural Diamond Council, the major mining companies, and a substantial portion of the traditional dealer and retail trade, holds that natural and lab-grown diamonds are fundamentally different products that should be priced and marketed in different segments. The argument is that natural diamonds are scarce, geologically unique, with documented multi-billion-year provenance and intrinsic store-of-value characteristics, while lab-grown diamonds are commodity manufactured products that should not be sold under premium pricing or implicit-equivalence framing. This position has been operationalised through clear disclosure requirements (which all parties accept), separate certification systems (GIA's separate lab-grown reports), separate retail merchandising, and marketing campaigns emphasising natural diamonds' geological and emotional uniqueness.

The integration position, advocated by Signet Jewelers (the largest U.S. retail jeweller, holding Kay, Zales and Jared) since the late 2010s, by Pandora (which converted its diamond programme entirely to lab-grown in 2021), by a substantial portion of the e-commerce diamond retail sector (Brilliant Earth and others), and by many indie designers and bridal-segment brands, holds that lab-grown diamonds are a legitimate consumer choice that the trade should support without prejudice, that the market should set relative pricing through normal competitive mechanisms, and that the differentiation position represents an attempt to defend natural-diamond margins through marketing rather than through inherent product superiority.

Where the data sits

The empirical situation as of the mid-2020s includes the following elements:

• Lab-grown diamond market share in the U.S. bridal segment has grown from low single digits in 2018 to estimated 40 to 50 percent of engagement-ring sales by unit volume by 2024 (Edahn Golan and Tenoris market data, with some variation between sources).
• Average natural-diamond prices, as measured by the Rapaport Diamond Price List and by other index measures, have declined approximately 20 to 30 percent from peak 2022 levels through 2024, with the decline concentrated in the 0.5-to-3-carat bridal range.
• De Beers acknowledged in 2024 that it was reconsidering its earlier Lightbox lab-grown diamond programme, which had been positioned as a low-priced fashion-jewellery offering specifically to draw a clear price line between lab-grown and natural; the strategic review reflected the difficulty of holding the differentiation line as lab-grown prices fell to commodity levels.
• Lab-grown diamond wholesale prices for one-carat round brilliants declined from approximately $4,000 to $5,000 in 2018 to under $1,000 by 2023 and lower in 2024.
• Natural-diamond inventory at the rough-trading level (De Beers sights, Alrosa, and the secondary rough market) accumulated substantially through 2023 and 2024 as midstream dealers reduced rough purchases in response to the polished-price decline.

The retail-trade dimension

Retail jewellers face a particular problem because the price relationship between natural and lab-grown diamonds is now shaping consumer expectations across the entire price spectrum. A consumer who sees lab-grown diamonds at $1,000 per carat may revise expectations about natural diamonds even where the consumer ultimately chooses natural. Retail jewellers have responded with various strategies:

• Maintain natural-diamond focus and decline to stock lab-grown, emphasising the differentiation argument.
• Stock both natural and lab-grown with clear disclosure and let the customer choose.
• Lead with lab-grown in advertising and stock to capture the price-sensitive segment, with natural diamonds as a premium upgrade option.
• Convert primarily or entirely to lab-grown (the Pandora model).

The fragmentation across these strategies is part of what "industry split" describes. There is no industry consensus on the right approach, and individual retailers and brands have made different commercial bets that reflect different views of how the natural-vs-lab-grown relationship will resolve over the medium term.

The disclosure question

Disclosure of lab-grown status, by contrast, is an area of broad industry agreement. The U.S. Federal Trade Commission's 2018 revisions to its Jewelry Guides confirmed that synthetic diamonds may be called "diamonds" but must be clearly disclosed as synthetic, lab-grown, lab-created, or [manufacturer]-created. The GIA, IGI and other gemmological laboratories issue separate report types for lab-grown diamonds, with distinct certificate formats and laser-inscription protocols ensuring that lab-grown stones are identifiable as such throughout their commercial life. The CIBJO Diamond Blue Book provides parallel international nomenclature standards.

The trade does not generally dispute the disclosure framework. The disagreement is about the marketing and pricing of disclosed lab-grown diamonds relative to disclosed natural diamonds, not about whether disclosure should occur. Both the differentiation and integration positions accept that lab-grown stones should be sold under clear lab-grown identification.

Detection and verification

The disclosure framework depends on detection capability, and substantial investment has gone into detection technology since the late 2010s. Modern detection instruments, including the GIA Synthetic Detection Instruments, the De Beers Group SYNTHdetect and AMS series instruments, and similar tools from other manufacturers, can reliably distinguish natural from lab-grown diamonds for the trade and for retail-level screening. Inadvertent or intentional substitution of lab-grown for natural diamonds in mounted jewellery and parcel goods has been a concern at various points (the Greenland scandal of 2019 involving lab-grown stones in parcels sold as natural is a notable case), but the detection infrastructure is now sufficiently mature that systematic substitution at the trade level is detectable.

The longer-term question

The longer-term question that the industry split reflects is whether natural and lab-grown diamonds will eventually settle into clearly distinct market segments (with natural diamonds as a premium category like fine art or fine wine, and lab-grown as a separate commodity category), or whether the price differential will compress further until the two categories effectively merge into a single market priced primarily by physical characteristics (size, colour, clarity, cut) without significant premium for natural origin. The differentiation position bets on the first outcome; the integration position bets on (or accepts) the second.

The resolution will likely depend on factors including the future trajectory of lab-grown production costs (further declines toward $100 per carat or stabilisation at current levels), the marketing investment of the natural-diamond producers (the Natural Diamond Council and brand-specific campaigns by De Beers, Forevermark and others), the brand-strategy choices of major retailers, and the consumer-demographic changes in the bridal market as younger generations move through engagement-age cohorts.

Broader implications

The lab-grown question has implications beyond the immediate diamond trade. Coloured-gemstone producers and dealers have watched the diamond split closely, because synthetic ruby, sapphire, emerald and spinel production exists at substantial scale and could in principle follow a similar trajectory if lab-grown coloured stones moved from their current predominantly low-price use into bridal and high-jewellery applications. The resilience of natural coloured-stone pricing, which has held up better than natural-diamond pricing in the same period, partly reflects the smaller scale of synthetic coloured-stone production but also reflects the more fragmented and origin-driven structure of the coloured-stone market that may be more resistant to commodity substitution than the more standardised diamond market.

For the working trade, the practical guidance is to take a clear position rather than attempt to straddle, to disclose lab-grown stones clearly under the FTC and CIBJO frameworks, and to communicate the chosen position to customers in terms that match the trade's actual practice rather than industry-level rhetoric.