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: Rarest Gemstone
Frequently Asked Questions (FAQ) / Rarest Gemstone

What is the rarest gemstone?

The rarest and most expensive of all gemstones is red diamond. In fact there are only perhaps 20 to 30 red diamonds known to exist, and most weigh less than half a carat. When offered at auction, they typically sell for more than $1 million per carat. The largest red diamond known is the 5.11 carat Moussaieff Red Diamond, a trillion-cut diamond from Brazil. For more information see our article on the world's rarest gemstone.

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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