Top 10 hardest gemstones - Know Your Gem

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Radiant 10 Hardest Gemstones:, Mean, Ethical Source, Prices

Gemstone Categories (by Mohs Hardness)

Ruby (9)
Alexandrite (8.5)
Emerald (7.5–8)
Aquamarine (7.5–8)
Tourmaline (7–7.5)

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