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: Help Central
Need Some help? You've Come to the Right Place:
•  Frequently Asked Questions
•  Contact Customer Service
•  Shipping Information and Policy
•  Payment Options and Check Out Information
•  Security & Privacy Policy
•  Gemstone Guarantee
•  GemSelect Customer Reviews
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•  International Shipping and Orders
•  Return Policy
•  Thai Shipping Holidays
•  Choosing A Gemstone Supplier
•  Gemstone Type List
•  Gemstone Buyer's guide
•  Gemstone Information
•  Calibrated Gemstones
•  Gemstone Articles
•  GemSelect Monthly Newsletters
•  Cleaning Gemstones
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  • First Published: February-20-2006
  • Last Updated: May-24-2017
  • © 2005-2017 all rights reserved.
    Reproduction (text or graphics) without the express written consent of (SETT Company Ltd.) is strictly prohibited.
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Colored Gemstones
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