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Frequently Asked Questions (FAQ) / Calibrated Size Chart

Are there any kinds of gemstones that are always untreated?

Yes, many varieties of gemstones are rarely or never treated. They include spinel, all the different garnet varieties (spessartite, rhodolite, tsavorite, almandine, pyrope and hessonite), tourmaline, peridot, orange and brown zircon, prehnite, fluorite, kyanite and a number of other varieties. About 75% of all the gems in our inventory are completely untreated. Click here to see all of our untreated gemstones.

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  • First Published: February-20-2006
  • Last Updated: November-11-2014
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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