Price is not linear with size. A 2-carat diamond costs far more than two 1-carat diamonds because larger rough is rarer. Lab grown narrows that curve; natural steepens it. The table below shows median total price at the carat weights buyers actually shop, lab grown next to natural.
RockHer Reviews is published by RockHer Haute Jewels. The market data on this page is sourced from CaratRadar, RockHer's diamond pricing product. We may refer you to rockher.com to purchase; we do not sell on this page.
Diamond Prices in 2026: Price by Carat, Shape, and Type
Diamond price comes down to four things: type (lab grown vs natural), carat weight, shape, and the 4Cs. The figures below are median total prices from CaratRadar, held to a fixed quality standard (D-F color, VS clarity or better, Ideal cut, certified) so the only variables are type, size, and shape.
How much does a diamond cost per carat in 2026?
In 2026 a 1-carat lab grown diamond (D-F, VS, Ideal, certified) has a median price of about $759, while a comparable 1-carat natural diamond runs about $3,690. Price rises sharply with carat weight, and the natural premium widens as the stone gets larger.
How much should a 1, 1.5, 2, or 3 carat diamond cost?
At the D-F / VS / Ideal / certified standard, a lab grown diamond runs a median of about $407 at 0.5ct, $759 at 1ct, $1,151 at 1.5ct, $1,610 at 2ct, and $2,365 at 3ct. The natural equivalent runs $1,006, $3,690, $8,179, $16,604, and $39,280 at the same weights.
Table A — Median price by carat, lab grown vs natural, all shapes blended (D-F, VS+, Ideal, certified). CaratRadar market data, May 2026.
| Carat | Lab grown | Natural | Natural premium | Difference |
|---|---|---|---|---|
| 0.5 ct | $407 | $1,006 | 2.5× | $599 |
| 1.0 ct | $759 | $3,690 | 4.9× | $2,931 |
| 1.5 ct | $1,151 | $8,179 | 7.1× | $7,028 |
| 2.0 ct | $1,610 | $16,604 | 10.3× | $14,994 |
| 3.0 ct | $2,365 | $39,280 | 16.6× | $36,915 |
Are lab grown diamonds cheaper than natural, and by how much?
Yes. At a 1-carat round, a natural diamond costs about 4.9 times a comparable lab grown diamond, a difference of roughly $2,931. The multiple widens with size, reaching about 16.6 times at 3 carats, where the gap is nearly $37,000 for the same quality.
The pricing gap is largest at sizes where natural rarity dominates. A 1-carat stone is common in natural inventories, so the lab grown discount is meaningful but not extreme. A 3-carat natural at top color and clarity is genuinely rare and priced accordingly, while the same stone in lab grown is straightforward to produce, so the multiple climbs. Want the full comparison beyond price? See lab grown vs natural diamonds.
Does diamond shape affect price?
Yes. Shape changes both price and how large a diamond looks on the finger. Fancy shapes such as marquise, pear, and princess tend to price below a round of the same carat and quality, while shapes like radiant and cushion can run higher in the blended averages because of the carat mix buyers choose in them.
Table B — Median price by shape, lab grown vs natural, averaged across carat weights at the D-F / VS+ / Ideal standard. CaratRadar market data, May 2026.
| Shape | Lab grown | Natural |
|---|---|---|
| Round | $826 | $5,818 |
| Oval | $927 | $6,145 |
| Cushion | $1,077 | $6,537 |
| Princess | $836 | $4,397 |
| Emerald | $1,034 | $5,780 |
| Pear | $792 | $4,191 |
| Marquise | $694 | $3,441 |
| Radiant | $1,024 | $6,825 |
| Heart | $951 | $3,879 |
| Asscher | $1,217 | $3,622 |
These are averages across all carat weights, so they reflect typical purchase price by shape rather than a strict like-for-like per-carat comparison. At equal carat weight, a round brilliant usually costs the most per carat because cutting one wastes the most rough; an elongated oval or pear looks larger on the finger than a round of equal weight, which is why shoppers chasing visual size often choose them.
What should I budget for a center diamond?
For a 1 to 1.5 carat lab grown center at top quality, budget roughly $760 to $1,150. For a natural center at the same size and quality, budget roughly $3,700 to $8,200. The setting is a separate cost.
Once you know your center budget, the next decision is the setting it sits in.
How we calculate these prices
Every figure is the median total price for certified diamonds at a fixed quality standard (D-F color, VS clarity or better, Ideal cut), pulled from CaratRadar, RockHer's diamond market-data product, and refreshed on a regular cadence.
Pricing data sourced from CaratRadar.com.
Diamond price FAQ
How much does a 1 carat diamond cost in 2026?
At the D-F / VS / Ideal / certified standard, a 1-carat lab grown diamond has a median price of about $759, while a comparable 1-carat natural diamond runs about $3,690, roughly 4.9 times more.
Why is the same carat weight priced differently across shapes?
Cutting yield. At equal carat weight, a round brilliant wastes the most rough, so it typically costs the most per carat; fancy shapes retain more and cost less. The by-shape averages above blend different carat mixes, so they show typical price by shape rather than a strict per-carat comparison.
Are these prices for the diamond only or the finished ring?
The diamond only. A setting is a separate cost, cast to order around your chosen stone.
Where does this diamond price data come from?
The figures are median total prices from CaratRadar, RockHer's diamond market-data product, held to a fixed quality standard. Last updated May 31, 2026.