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: Calibrated Gemstones
Frequently Asked Questions (FAQ) / Calibrated Gems for Replacing Lost Stones & Custom Jewelry

What is a Calibrated Gemstone?

Calibrated Diamond and Sapphire

A calibrated gemstone is one that has been cut to fit standard size commercial gemstone jewelry mountings and settings. Examples are 7 mm x 5 mm oval shape gemstones, or a 6 mm round shape gem. Calibrated gemstones are not cut to exact measurements, but they are cut to sizes that most standard size mountings can accommodate.

There will always be some variance; usually for gemstones over 1 carat in weight, a size variance within 0.04% is acceptable, depending on the exact jewelry design of course. Above in the photo are two 6 mm round diameter stones, but the diamond is almost half the weight of the sapphire.This is why gemstones should be bought by size rather than weight.

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  • First Published: February-20-2006
  • Last Updated: September-12-2017
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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