Lab-grown versus natural, what the resale data actually shows
A 1-carat lab-grown diamond averaged $3,410 per carat at retail in 2020. By mid-2026 that figure sits at approximately $564. Here is what that trajectory means for what you are acquiring.
In 2020, a 1-carat lab-grown diamond averaged $3,410 per carat at retail. By mid-2026, that figure sits at approximately $564 according to StoneAlgo's rolling index of over 500,000 stones. In six years, the retail price of a lab-grown diamond fell by more than 83 percent.
At wholesale, the collapse is even more pronounced. In mid-2018, the average wholesale trading price of a 1-carat lab-grown diamond was $1,800 per carat. By mid-2026, that same stone traded at approximaly $80 per carat, according to Edahn Golan Diamond Research, the most respected wholesale price analyst in the industry. A decline of more than 97 percent in seven years.
Understanding why it happened is the most important thing a buyer can know before spending money on a diamond in 2026.
This piece does not argue that lab-grown diamonds are bad. Chemically, physically, and optically identical to natural ones. What they are not is an acquisition with the same characteristics as a natural diamond- those are two different things. The market has now confirmed the distinction with data that cannot be argued with.
What happened to lab-grown prices
The cause of the collapse was not quality. Lab-grown diamonds got better as production scaled, the cause was supply.
Between 2020 and 2023, global lab-grown diamond production capacity grew by more than 300 percent. New CVD and HPHT facilities in China and India scaled aggressively to meet surging demand. Inventory overhangs reached 18 to 24 months of forward demand at the wholesale level, which means prices had one direction to go.
According to Edahn Golan's Q1 2026 wholesale price list, midstream prices for loose lab-grown diamonds fell a further 14 percent year over year in the first quarter. A three-carat VVS D color round traded at a wholesale price of $126 per carat in that period, 30 percent cheaper than 2025. Wholesale prices fell an average of 26 percent across all of 2025, and the Edahn Golan wholesale index is now down 96 percent since tracking began in 2018.
De Beers, the world's largest diamond company by value, confirmed what the data showed. In their own statement closing Lightbox, their lab-grown diamond brand, in May 2025, they noted that lab-grown diamond prices in the jewelry sector had fallen 90 percent at wholesale since launch, tracking closer to a cost-plus model as they diverged from natural diamond prices. Those are De Beers' own words. Cost plus means the production cost of the stone, plus a thin margin, and nothing else.
De Beers launched Lightbox at $800 per carat in 2018. They cut the price to $500 per carat in 2024. They closed the brand permanently on May 9, 2025 after it lost $101.3 million in 2023 alone.
The rate of decline is now slowing. Edahn Golan's Q2 2026 data shows wholesale prices fell 13 percent year over year in the second quarter, a milder drop than Q1's 14 percent and significantly slower than the 26 percent decline recorded across all of 2025. The floor is forming. But what matters for a buyer today is not whether prices will fall further. It is what the trajectory means for what has already been acquired.
The resale reality
Lab-grown diamonds resell for 10 to 30 percent of their original purchase price. Some jewelers will not buy them back at all, because the production cost of a new stone has fallen below what they would need to pay for a used one.
Natural diamonds resell for 25 to 50 percent of their original retail price through a reputable buyer. Neither is an investment vehicle in the conventional sense. But the difference between 10 and 50 percent at the point of resale. On a $15,000 acquisition, that is the difference between recovering $1,500 and recovering $7,500+.
The reason the gap exists is simple. Natural diamond prices are supported by finite geological supply, a natural diamond cannot be manufactured on demand. A lab-grown diamond can be produced whenever demand exists, and production costs fall every year. That falling production cost drags the secondary market price down continuously, because any secondary buyer is competing against a falling retail price for a new stone. Lab-grown diamonds behave more like high-end electronics than precious gems. Beautiful at the moment of acquisition and depreciating in a predictable direction thereafter.
GIA confirmed this institutional reality on October 1, 2025, when it stopped grading lab-grown diamonds using the full 4Cs system and moved to two simplified categories: Premium and Standard. In its own announcement, GIA stated clearly that it would no longer use nomenclature created for natural diamonds to describe what it called a manufactured product. The most authoritative grading body in the world drew a formal line between natural and synthetic. GIA president and CEO Pritesh Patel stated: using descriptive terms for the quality of laboratory-grown diamonds is appropriate as most fall into a very narrow range of color and clarity.
What natural diamonds are doing in the same period
While lab-grown prices collapsed, natural diamonds experienced something different: a correction.
A natural 1-carat D/VVS2 round brilliant retails for approximately $4,600 in the US market as of mid-2026. That is down from 2021 peaks, reflecting broader market pressure from lab-grown competition and shifting consumer preferences. But the correction in natural diamond prices is a market cycle. The collapse in lab-grown prices is a structural condition driven by unlimited supply.
The factors supporting natural diamond prices are not sentimental. Global diamond mining has fallen to multi-decade lows of roughly 100 million carats annually. Major mines in Botswana, Canada, and Russia are approaching maturity with declining ore grades. The Diavik mine in Canada reached final production in March 2026. And, new supply is not coming at scale.
At the collector level, the distinction is sharper still. Rare, large, and fancy-colored natural diamonds ended 2025 with robust demand. Stones of 7 to 15 carats and vivid-colored diamonds performed strongly against a broadly softer market. The auction houses confirmed it.
The honest position on lab-grown diamonds
Lab-grown diamonds are the right choice for a specific buyer. Someone who wants the beauty and physical properties of a diamond, understands that resale is not their priority, and prefers to allocate their budget to a larger stone rather than to geological scarcity. More than 45 percent of US engagement rings now contain a lab-grown center stone.
What it is not is the same acquisition as a natural diamond.
The buyer who understands this distinction is not choosing between two equivalent options. They are making two different decisions about what they want their acquisition to be.
Both are valid.
Only one compounds over time.
Only one is accepted without qualification at Sotheby's, Christie's, and Bonhams.
Only one has a geological formation story that took billions of years and cannot be replicated on demand.
The market has made it clearer than it has ever been.
What I look for and why it does not change
When I source a diamond for a client, the conversation begins with the certificate and the stone's natural origin. Not because lab-grown diamonds are inferior objects. Because my clients are acquiring something they intend to hold, pass on, or liquidate at a point in the future, and the asset characteristics of a natural diamond at investment grade are categorically different from those of a lab-grown equivalent.
GIA certified. Natural origin confirmed. D through F color. Excellent cut. VS clarity. 18k gold setting. Those specifications have not changed. The market's confirmation of why they matter has never been louder.
Private inquiries regarding natural diamond acquisition are handled personally by Claudia. Contact via WhatsApp or the SLIMMS website.