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Nafco Gems Gemstone Size Chart

NAFCO Gems colored gemstone size chart to be used as an estimated gemstone size comparison guide for round and square gemstone melee in various gemstones types. These gemstones include sapphires, rubies, emeralds, diamonds and more.

Please keep in mind that this is an estimated gemstone size reference guide only.


Round Calibrated Diamond-Cut


mm 1 1.3 1.5 1.7 2 2.2 2.5 2.7 3 3.2 3.5 3.7 4
Sapphires .005 .01 .02 .03 .04 .06 .09 .10 .15 .16 .22 .27 .32
Rubies .005 .01 .02 .03 .04 .06 .09 .10 .15 .16 .22 .27 .32
Emeralds .015 .04 .05 .07 .08 .10 .12 .15 .18 .20
Zircons .025 .04 .06 .08 .12 .13 .19
Tsavorites .01 .015 .025 .04 .05 .07 .09 .12 .15 .20
Diamonds 0.005 0.01 0.015 0.02 0.03 0.04 0.06 0.07 0.10 0.12 0.16 0.18 0.25


Square Calibrated Princess-Cut


Nafco Gems Gemstone Size Chart
mm 1.7 2 2.2 2.5 2.7 3 3.2 3.5 3.7 4
Sapphires .04 .06 .08 .12 .14 .19 .24 .29 .35 .42
Rubies .04 .06 .08 .12 .14 .19 .24 .29 .35 .42
Diamonds 0.04 0.06 0.07 0.100.13 0.17 0.21 0.27 0.31 0.36