Diamond prices by carat size: the 2026 chart
Updated November 2026
Diamond pricing isn't linear — it climbs in steps, and the steps get steeper as stones get bigger. A 2 carat natural diamond isn't twice the price of a 1 carat; it's three to four times the price. This chart shows the whole ladder, natural and lab-grown, so you can see exactly where your budget lands.
Quick answer: for the quality range most buyers choose (round, G–H color, VS2–SI1 clarity, excellent cut), a natural diamond runs roughly $3,500–$6,000 at 1 carat and $12,000–$20,000 at 2 carats. Lab-grown runs $600–$1,200 at 1 carat and $1,800–$3,500 at 2 carats — and the gap keeps widening with size.
The full price ladder
Loose-stone U.S. retail ranges for well-cut, eye-clean stones. Add $250–$2,000 for a setting depending on style and metal.
| Carat | Face-up size (round) | Natural | Lab-grown | Lab savings |
|---|---|---|---|---|
| 0.25 ct | 4.1 mm | $500–$900 | $150–$300 | ~65% |
| 0.50 ct | 5.1 mm | $1,500–$3,500 | $300–$700 | ~75% |
| 0.75 ct | 5.8 mm | $2,500–$4,500 | $450–$900 | ~78% |
| 1.00 ct | 6.5 mm | $3,500–$6,000 | $600–$1,200 | ~80% |
| 1.50 ct | 7.4 mm | $7,000–$12,000 | $1,000–$2,000 | ~83% |
| 2.00 ct | 8.1 mm | $12,000–$20,000 | $1,800–$3,500 | ~84% |
| 2.50 ct | 8.8 mm | $18,000–$30,000 | $2,800–$5,000 | ~85% |
| 3.00 ct | 9.3 mm | $25,000–$42,000 | $4,000–$8,000 | ~85% |
Carat is weight, not size: 1 carat = 0.2 grams. Face-up diameter is what you actually see on the hand.
Magic weights: why 0.90 ct is the smartest buy on the chart
Diamond prices jump at the "magic" weights — 0.50, 0.75, 1.00, 1.50, 2.00 carats — because demand piles up at round numbers. A 0.90 carat stone can cost 15–25% less than a 1.00 carat of identical quality, yet the two are nearly impossible to tell apart on a hand: about 6.3 mm vs 6.5 mm face-up.
Why price-per-carat climbs so fast
Large rough diamonds are exponentially rarer than small ones, so every extra carat of finished weight costs more than the one before it. That's the natural-diamond story. Lab-grown diamonds don't share that rarity curve — growing a bigger crystal just takes more time in the reactor — which is exactly why the lab discount widens from about 65% at a quarter carat to about 85% at three carats.
Practical upshot: if your heart is set on a big stone, lab-grown is where the math tilts hardest in your favor. If you're buying natural, the sweet spots for value are just under the magic weights.
Same budget, three ways to spend it
| Strategy | Stone | Approx. total |
|---|---|---|
| Classic natural | 0.90–1.00 ct natural, G–H, VS2–SI1 | $4,300–$6,500 |
| Max size, lab | 2.00–2.50 ct lab-grown, F–G, VS1 | $2,500–$4,200 |
| Balanced lab | 1.50 ct lab-grown + upgraded pavé setting | $2,200–$3,500 |