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Best High Hardness

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Rankings use category fit, feature coverage, pricing signals, public reception, and recency. Affiliate relationships do not affect scores.

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Best 1 Phenakite
Phenakite

Rare beryllium silicate mineral prized for its high refractive index and brilliance; notable sources include Russia's Ural Mountains and Minas Gerais, Brazil.

Gemstone Collector Rare Colorless Silicate High Hardness
7.03 Good
2 Rhodizite
Rhodizite

An extremely rare beryllium boroaluminate mineral reaching Mohs hardness 8, among the hardest borates known, found primarily in Madagascar and the Ural Mountains of Russia.

Gemstone Jewelry Madagascar Colorless Borate High Hardness
5.06 Average
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