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: Calibrated Gemstones
Frequently Asked Questions (FAQ) / Calibrated Gemstones

What is a calibrated gem?

A calibrated-sized gemstone is one cut to fit standard commercial gem settings. Examples are 7 x 5 mm oval or 6 mm round.

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  • First Published: February-20-2006
  • Last Updated: March-22-2017
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    Reproduction (text or graphics) without the express written consent of GemSelect.com (SETT Company Ltd.) is strictly prohibited.
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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