Lab-grown prices have stopped falling. Here is why that matters.

For four years the story about lab-grown diamonds was that the price kept collapsing. That story is out of date. Prices have flattened, and understanding why tells you more about what you are buying than any sales pitch will.

What actually happened, in two numbers

A one-carat lab-grown diamond cost roughly $3,410 in January 2020 and averaged about $892 by December 2024, a fall of around 74% in five years. That is the collapse everyone remembers.

Then it stopped. Wholesale prices dropped sharply again through 2025, but 2026 has been close to flat: per-carat prices are down roughly 2.6% year on year, and the last four quarters produced the smallest declines in two years. Some categories have ticked up slightly.

Why the fall stopped

Because the price reached the floor of what it costs to make the thing.

A certified colorless stone still requires weeks of reactor time, a great deal of electricity, precise hand cutting and polishing, and an independent grading fee. No grower can sell below that for long. The steep years were the market discovering where the floor was; 2026 is the market sitting on it.

Analysts now broadly expect stability rather than further collapse. Efficiency will keep improving and that will keep gentle downward pressure on prices, but the era of a third coming off the price every year is finished.

What this means if you are buying now

Waiting no longer saves you meaningful money. A year of waiting used to be worth hundreds of dollars; at current rates it is worth very little.

More usefully: a price far below the market floor is now a warning rather than a bargain. If a certified E-to-F, VS2-or-better stone is priced well under what it costs to grow, cut and grade, something in that description is not what it claims to be. Check the certificate.

And a price far above the market tells you about the seller's overheads, not the stone. That gap is the single most useful thing to compare between jewelers. We grow, cut, certify and set in-house, which removes the grower's, wholesaler's and distributor's margins that otherwise stack underneath the retail price.

The resale question, answered honestly

Here is where most jewelers get vague. We will not.

A lab-grown diamond will resell for a fraction of what you paid. Retail price includes a margin no second-hand buyer will pay again, and yours competes against new stones that get slightly cheaper each year.

But apply the same honesty to the alternative. Mined diamonds do not hold retail value either. The Rapaport index for one-carat natural diamonds fell over 11% across 2025 alone. Most mined stones resell at a steep discount for exactly the same reason: you paid retail, and resale is not retail.

If you want an appreciating asset, buy an asset. If you want to wear something beautiful for forty years, this is a better stone for the money by a wide margin, and that is the actual decision in front of you.

What does not change

The stone itself. A lab-grown diamond is diamond: the same carbon, the same lattice, the same hardness, the same fire. It will not cloud, dull or reveal itself over time, and IGI grades it on the same scale as a mined stone because there is nothing to grade differently.

In forty years it will look exactly as it does the day you collect it, whatever the market has done in the meantime.

More on how lab-grown compares to mined, including what to ask any seller, in lab-grown vs natural diamonds and chapter four of our diamond education. Figures here reflect industry wholesale and retail data published through mid-2026.

See current prices on engagement rings, diamond studs and tennis bracelets.