What Lab-Grown Diamonds Actually Cost

A lab-grown diamond is a real diamond. Same carbon, same crystal structure, same hardness, and the same look to the eye across a counter. What differs is how it was made, how much it costs, and what happens when you try to sell it.

The short answer on price: the wholesale cost of lab-grown material has collapsed, and the retail price has not collapsed with it. Most of the gap now sits with the seller rather than the buyer.

Why has the price fallen so far?

Because production caught up with demand, and it did not stop.

Wholesale lab-grown prices fell another 14% year over year in the first quarter of 2026 and 13% in the second, after a 26% decline across the whole of 2025. A three carat VVS D colour round traded at $126 per carat, which is 30% cheaper than the same stone a year earlier. On the index that has tracked this market since 2018, wholesale prices are now down 96% (JCK, reporting Edahn Golan's wholesale price list, 10 August 2026).

Read that last figure slowly. A category that cost nearly as much as mined diamonds when it arrived now trades at a small fraction of it, and the fall is still going, if more slowly than it was.

So why does the ring in the shop window not look 96% cheaper?

Because the saving happens upstream of the price tag.

Paul Zimnisky's retail margin analysis, updated in May 2026, found retailers taking a markup of more than 80% above wholesale on lab-grown goods, with a delta of only one or two percentage points between 2025 and 2026 (JCK). Wholesale fell hard two years running. The markup held.

That is the single most useful thing to know before you shop. The question is not whether lab-grown is cheaper than mined, because it plainly is. The question is how much of a falling wholesale price the shop in front of you is passing on, and the answer varies enormously between sellers.

Two practical consequences:

- Compare stones, not stories. Ask for the certificate, the exact measurements and the grades, then compare that specification across sellers. A "70% off" sign tells you about the seller's chosen starting figure. - Recent prices age badly. A quote from a year ago describes a market that has moved twice since.

Will the seller tell me which one it is?

They have to, and the rules are specific about how.

The Federal Trade Commission requires a laboratory-created diamond to be described as laboratory-grown, laboratory-created, [manufacturer]-created or similar wording, placed immediately before the word diamond and equally conspicuously, so the nature of the product is clear at the point the claim is made. Burying the disclosure behind a vague hyperlink, in an FAQ or on a separate education page does not satisfy it, because a shopper can easily miss it (FTC).

If you have to hunt for the word laboratory, that itself tells you something about the seller.

What will my lab-grown diamond be worth later?

Less than you paid, and the reason is the same 96%.

Anyone buying a stone from you is competing against new production, and new production keeps getting cheaper. A buyer pays against today's replacement cost, not against your receipt. When today's cost has fallen by double digits two years running, the resale figure follows it down.

This is not an argument against buying one. It is an argument against buying one as a store of value. A lab-grown diamond is jewelry, priced as jewelry, and the sensible way to think about it is the way you think about anything else you buy to wear rather than to sell.

If resale matters to you, that is a reason to look at mined stones, where a secondary market has existed for a century, or at pieces whose value sits partly in the metal and the workmanship.

Is a lab-grown diamond worth buying?

For plenty of people, yes, and for a clear reason: at the same budget you get a larger or better-graded stone than mined material allows.

It suits you if you want maximum size or clarity for the money, you are buying something to wear rather than to hold, and you would rather put the difference towards the setting or towards not spending it at all.

It suits you less if you expect to trade the stone in later, if you want the piece to hold a resale figure, or if the origin of the stone matters to you for its own sake. Neither position is wrong. They are different purchases.

What does not vary is the specification. Colour, clarity, cut and carat behave the same way in both categories, and the certificate is what lets you compare one offer against another rather than one sales pitch against another.

If you are weighing a lab-grown stone against a mined one, bring both quotes to us and we will read the certificates with you, including the parts the pricing depends on. See our lab-grown diamonds, or the engagement rings we hold.