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: Untreated Gems
Frequently Asked Questions (FAQ) / Which Gemstones Types Are Untreated?
Collection of Natural Gems

Are there any kinds of gemstones that are always untreated?

Yes, there are many varieties of gemstones that are rarely treated, and many that are never treated. What many find very surprising is that we have over 30,000 untreated gemstones available! That means about 75% of all the gems in our inventory are completely untreated! Click here to see all of our untreated gemstones.

Some of the many untreated gem types include spinel, all of the different members of the garnet variety (spessartite garnet, rhodolite garnet, malaya garnet, mali garnet, tsavorite garnet, demantoid garnet, almandine garnet, pyrope garnet, melanite garnet, grossularite garnet and hessonite garnet); the many varieties of tourmaline, including rubellite tourmaline (pictured above), Pariaba tourmaline, verdelite (green tourmaline), indicolite (blue tourmaline); as well as peridot, orange and brown zircon, prehnite, fluorite, kyanite and a number of other beautiful gem varieties.

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  • First Published: February-20-2006
  • Last Updated: July-27-2017
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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