Reference

Diamond sizes and prices, by carat and shape

Carat is weight, not size — and the same weight looks very different across shapes. Every combination below gives the true face-up size in millimeters, the retail price, and the resale figure nobody else publishes.

Value your own diamond

Face-up size in millimeters, every weight and shape

CaratRoundOvalPrincessCushionEmeraldPearMarquiseRadiantAsscherHeart
0.25 ct4.09×4.094.85×3.593.46×3.463.53×3.534.41×3.155.04×3.466.61×3.153.91×3.43.53×3.534.03×4.03
0.5 ct5.16×5.166.11×4.524.37×4.374.44×4.445.56×3.976.35×4.378.33×3.974.92×4.294.44×4.445.08×5.08
0.75 ct5.91×5.917×5.185×55.09×5.096.36×4.547.27×59.54×4.545.63×4.915.09×5.095.81×5.81
1 ct6.5×6.57.7×5.75.5×5.55.6×5.67×58×5.510.5×56.2×5.45.6×5.66.4×6.4
1.25 ct7×78.29×6.145.92×5.926.03×6.037.54×5.398.62×5.9211.31×5.396.68×5.826.03×6.036.89×6.89
1.5 ct7.44×7.448.81×6.526.3×6.36.41×6.418.01×5.729.16×6.312.02×5.727.1×6.186.41×6.417.33×7.33
2 ct8.19×8.199.7×7.186.93×6.937.06×7.068.82×6.310.08×6.9313.23×6.37.81×6.87.06×7.068.06×8.06
2.5 ct8.82×8.8210.45×7.747.46×7.467.6×7.69.5×6.7910.86×7.4614.25×6.798.41×7.337.6×7.68.69×8.69
3 ct9.37×9.3711.11×8.227.93×7.938.08×8.0810.1×7.2111.54×7.9315.14×7.218.94×7.798.08×8.089.23×9.23
4 ct10.32×10.3212.22×9.058.73×8.738.89×8.8911.11×7.9412.7×8.7316.67×7.949.84×8.578.89×8.8910.16×10.16
5 ct11.11×11.1113.17×9.759.4×9.49.58×9.5811.97×8.5513.68×9.417.95×8.5510.6×9.239.58×9.5810.94×10.94

All 110 pages

0.25 carat asscher0.25 carat cushion0.25 carat emerald0.25 carat heart0.25 carat marquise0.25 carat oval0.25 carat pear0.25 carat princess0.25 carat radiant0.25 carat round0.5 carat asscher0.5 carat cushion0.5 carat emerald0.5 carat heart0.5 carat marquise0.5 carat oval0.5 carat pear0.5 carat princess0.5 carat radiant0.5 carat round0.75 carat asscher0.75 carat cushion0.75 carat emerald0.75 carat heart0.75 carat marquise0.75 carat oval0.75 carat pear0.75 carat princess0.75 carat radiant0.75 carat round1.25 carat asscher1.25 carat cushion1.25 carat emerald1.25 carat heart1.25 carat marquise1.25 carat oval1.25 carat pear1.25 carat princess1.25 carat radiant1.25 carat round1.5 carat asscher1.5 carat cushion1.5 carat emerald1.5 carat heart1.5 carat marquise1.5 carat oval1.5 carat pear1.5 carat princess1.5 carat radiant1.5 carat round1 carat asscher1 carat cushion1 carat emerald1 carat heart1 carat marquise1 carat oval1 carat pear1 carat princess1 carat radiant1 carat round2.5 carat asscher2.5 carat cushion2.5 carat emerald2.5 carat heart2.5 carat marquise2.5 carat oval2.5 carat pear2.5 carat princess2.5 carat radiant2.5 carat round2 carat asscher2 carat cushion2 carat emerald2 carat heart2 carat marquise2 carat oval2 carat pear2 carat princess2 carat radiant2 carat round3 carat asscher3 carat cushion3 carat emerald3 carat heart3 carat marquise3 carat oval3 carat pear3 carat princess3 carat radiant3 carat round4 carat asscher4 carat cushion4 carat emerald4 carat heart4 carat marquise4 carat oval4 carat pear4 carat princess4 carat radiant4 carat round5 carat asscher5 carat cushion5 carat emerald5 carat heart5 carat marquise5 carat oval5 carat pear5 carat princess5 carat radiant5 carat round

Work out your own

These pages are worked examples. Put your own details in and get a figure matched to your piece.

Value your own diamond