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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 under one carat can be within 0.2 mm of the calibrated size in order to fit a standard setting. Over one carat, a 0.3 mm variance can usually be accommodated and sometimes more. Rounds stones will have a greater variance; in fact it is usually possible to mount a round stone of any size in the nearest size standard setting.

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