Ruby

A red, gem variety of corundum. The red colour is caused by minor amounts of trivalent chromium replacing aluminium in the crystal structure.

See:

Corundum

Ruby — specimen 0276, photo © NMNHS

Material from ‘Repository’

5 specimens: 0147 — 0.02 ct, Mozambique; 0318 — 0.11 ct, Myanmar; 0276 — 0.61 ct, Tanzania, Ruvuma, Songea; 0629 — 0.12 ct, Tanzania, Ruvuma, Songea; 0654 — 0.13 ct, no precise locality [East Africa].

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Gemmology — gemstones
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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.