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ARRANGED ACCORDING TO COLOR AND IN ORDER OF HARDINESS.

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Limpid.—Diamond, Sapphire, Topaz, Rock-Crystal.

Blue.—Sapphire, Topaz, Indicolite, Turquoise, Spinel, Aquamarine, Kaynite.

Green.—Oriental Emerald, Chrysoberyl, Amazon Stone, Malachite, Emerald, Chrysoprase, Chrysolite.

Yellow.—Diamond, Topaz, Fire-Opal.

Red.—Sapphire-Ruby, Spinel-Ruby, Rubellite, Garnet, Brazilian-Topaz, Hyacinth, Carnelian.

Violet.—Oriental-Amethyst, Amethyst.

Black and Brown.—Diamond, Tourmaline, Hyacinth, Garnet.

Barkham Burroughs' Encyclopaedia of Astounding Facts and Useful Information, 1889

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