A lab-grown diamond that sells for a few hundred dollars today might have cost several times that just a few years ago. Same carat weight, same clarity grade, same chemical composition. The only difference: it was grown in a factory rather than pulled from the earth. The story of how lab-grown diamonds went from a novelty to a retail phenomenon, and then to a cautionary tale about commodity pricing, is one of the more fascinating chapters in recent consumer economics.
How Lab-Grown Diamonds Are Actually Made
Lab-grown diamonds are not imitations. They are real diamonds, made of carbon atoms arranged in the same crystal structure as natural stones. There are two main methods used to create them.
The first is High Pressure High Temperature (HPHT), which replicates the conditions deep inside the Earth. A small diamond seed is placed in a chamber with carbon and subjected to pressures of around 725,000 pounds per square inch (about 5 gigapascals) and temperatures exceeding 1,400 degrees Celsius. Over days or weeks, carbon crystallizes around the seed, forming a larger diamond.
The second method is Chemical Vapor Deposition (CVD). In this process, a diamond seed is placed inside a chamber filled with carbon-rich gas, typically methane. Microwaves or other energy sources ionize the gas, causing carbon atoms to rain down onto the seed and build up layer by layer. CVD has become increasingly popular because it requires less extreme conditions and allows manufacturers to grow large, high-quality diamonds relatively efficiently.
Both methods produce stones that are physically and chemically indistinguishable from mined diamonds. Even professional gemologists need specialized equipment to tell them apart.
Why Prices Fell Off a Cliff
When lab-grown diamonds first entered the broader retail market in a meaningful way in the second half of the 2010s, they were priced at roughly a 20 to 30 percent discount to comparable natural stones. That discount reflected the novelty, the smaller scale of production, and the industry’s careful positioning of the stones as a premium, ethical alternative to mining.
Then manufacturing scaled up rapidly. Companies in China, India, and the United States expanded production capacity aggressively. The cost to grow a one-carat stone dropped dramatically as technology improved and competition intensified. By 2025, lab-grown diamonds were selling at discounts of roughly 70 to 80 percent compared to natural diamonds. In some cases, the collapse was even steeper. A one-carat lab-grown stone can now often be found for around $1,000 or less.
This is the classic story of commoditization. When a product can be manufactured at scale with no meaningful supply constraints, prices converge toward the cost of production. Unlike mined diamonds, which benefit from the finite and labor-intensive nature of extraction, lab-grown diamonds have no natural ceiling on supply. Any producer with the right equipment can make more.
Major retailers felt the impact. Signet Jewelers, the largest specialty jewelry retailer in the United States, has leaned into lab-grown fashion jewelry as demand for the lower-priced stones grew. Jewelers who had bought lab-grown inventory at earlier prices saw that stock lose value as prices fell.
What This Means for Buyers and the Industry
For consumers, the price collapse is largely good news. A lab-grown diamond offers the same visual and physical properties as a mined stone at a fraction of the cost, making it an appealing choice for engagement rings, earrings, and other jewelry. If you’re buying for beauty rather than investment, the value proposition is hard to argue with. If you’re shopping for an engagement ring setting or loose lab-grown diamond, the options at every price point have expanded dramatically.
The investment calculus is a different story entirely. Natural diamonds have historically held their value better simply because supply is constrained. Lab-grown stones, by contrast, are likely to keep declining in price as production grows more efficient. Buying lab-grown diamonds as a store of value makes little sense given current market dynamics.
The broader industry is still adjusting. Some natural diamond producers have leaned harder into the “rare and authentic” narrative to differentiate their product. Others launched their own lab-grown lines to capture demand across segments, though the results have been mixed: De Beers announced in May 2025 that it would close its Lightbox lab-grown brand, with trade press reporting that wholesale lab-grown jewelry prices had fallen about 90 percent since its 2018 launch.
What seems clear is that lab-grown diamonds have permanently changed the jewelry market. Prices are unlikely to recover to their earlier highs, and consumers now have more choice than ever. The question going forward is whether the industry can find a stable equilibrium, or whether continued manufacturing improvements will keep pushing prices lower still.
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