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  : Calibrated Size Tolerance
Frequently Asked Questions (FAQ) / Calibrated Size Tolerance

I need a 7 x 5 mm gem for a standard setting. How much can a gem vary from 7 x 5 mm and still fit?

As a general rule, gems weighing under one carat can be within 0.2 mm of the calibrated size in order to fit a standard setting. For gems weighing over one carat, a 0.3 mm variance can usually be accommodated and sometimes more. Round stones have a greater variance; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

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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