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  : 2 or 3 Measurements for Gems
Frequently Asked Questions (FAQ) / Gemstone Measurement

Most of your gems have measurements like 6 x 4 x 3 mm. But I notice some of the gems have only two measurements, such as 6 x 3 mm. Why is that?

The measurements we give for most of our gems are length by width by depth, with the measurements in millimeters. For round gems, however, we give just two measurements, since the length and width are the same. So when you see a set of measurements like 6 x 3 mm, it means the gem is round and 6 mm is the measurement for the diameter.

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  • First Published: February-20-2006
  • Last Updated: November-10-2014
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart