|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.