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NAFCO Gems Gemstone Information & Tools



NAFCO Gems would like to make your colored gemstone buying as easy as possible. On this page you will find links to gemstone information charts, gem guides, a diamond weight to colored gemstone size conversion calculator and more that we created specifically for the jewelry designer, custom jewelry manufacturer and retail jeweler.

We will be adding new gemstone information tools and specific gemstone information guides as we create them to assist you, our gem and jewelry trade clients, with the information you need to maximize you colored gemstone sales. Our gem tools will include a gemstone color meanings guide, healing gemstones chart with definitions, a birthstone chart, gemstone proprieties and much more.

Need colored gemstone info contact us or give us a call at 800-528-4900 we're here to help!

Gemstone Size Chart Gemstone Color Chart Gemstone Enhancements Guide


Diamond to Colored Gemstone Conversion Calculator





Nafco Gems Gemstone Color Chart



Nafco Gems realizes the need to communicate gemstone color. This is why we have developed our colored gemstone color chart. Our color chart is a tool to be used when communicating gemstone color with us. It's simple to use...just mouse over the color and a number / letter will pop up. When communicating with us just refer to that color number(s) / letter(s)...that's it!

Please keep in mind this is just a color reference guide and color will vary slightly from monitor to monitor.

Below is a color chart for reference:





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