What a lab-grown diamond actually costs in 2026

Nobody publishes a straight answer to this, so here is one. These are market averages for 2026, not our prices. Use them to judge any quote you are given, including ours.

The rough numbers

For a well-cut, certified stone in the range most people actually buy, G to H color, VS2 clarity, 2026 market averages look roughly like this:

• 0.5 carat: around $300 to $500
• 1 carat: around $725 to $1,500, with $725 a common average for a round
• 2 carat: around $1,700

Comparable mined stones run several multiples of these figures. The commonly cited gap is 80 to 85%.

Note what those numbers are: the loose stone. A finished ring adds the metal, the setting labor and the jeweler's margin, which is why a $725 diamond does not become a $725 ring.

Why two carats does not cost twice one carat

Price rises with weight, but for lab-grown it rises far more linearly than it does for mined stones, where a two-carat can cost four or five times a one-carat because large rough is genuinely rare.

There is still a premium for size, and it is a real one. Bigger crystals need longer in the reactor and lose more material in cutting: reactor time and yield loss both rise with size. That is why a five-carat rate per carat is higher than a one-carat rate, not five times lower.

The practical effect: stepping up in size costs less than most people expect, which is exactly why the average lab-grown center stone is now 2.0 carats against 1.6 for natural. What those sizes look like on a hand is in our carat size guide.

Shape moves the price too

Rounds cost slightly more per carat than fancy shapes. Not because they are better, but because cutting a round wastes more of the rough crystal than cutting an oval or an emerald from the same piece.

If budget is tight and you like elongated shapes anyway, you are being paid to have that taste.

Where the market has landed on quality

Something worth knowing before you agonize over grades: over 85% of lab-grown diamonds sold now fall in the top color bands: D, E and F. Yellowish J and K stones have effectively disappeared from the market. VS1 and VVS have become the working standard for clarity.

This is a real change from a decade ago and it means the price difference between a very good stone and an outstanding one has narrowed to almost nothing worth paying for. The market has already done the quality filtering for you.

How to use these numbers

Take any quote you are given and work backwards. Ask what the loose stone would cost at market, then look at what is left. That remainder is metal, labor and margin, and it should be explicable.

A price far below market is a warning, not a bargain. Certified colorless stones sit on a production-cost floor now; nobody can go meaningfully under it and still be selling what they say they are.

A price far above market is somebody's overheads. Retail rent, wholesale layers, and a brand name each add a margin. There is nothing wrong with paying for a shop you like. Just know that is what you are paying for.

Where we sit

We grow the stone in our own reactors, cut it, send it out for independent grading, and set it on the tenth floor of 15 West 47th Street. There is no grower's margin, no wholesaler's margin and no distributor's margin stacked underneath ours, because there is no grower, wholesaler or distributor.

That is the whole of our pricing argument, and you can check it against the numbers above.

Figures reflect published market averages for 2026 and will move. For how the grades themselves work, see chapter one of our diamond education. See our prices on engagement rings, diamond studs and tennis bracelets.