Ruby

Ruby is a gem which in value and hardness ranks next to the diamond. It is dichroic, of greater specific gravity than any other gem, and belongs to the hexagonal system of crystals. It is a pellucid, ruddy-tinted stone, and, like the sapphire, a variety of corundum, also found (but rarely) in violet, pink, and purple tints. The finest specimens come from Upper Burmah, now Myanmar. These are the true Oriental rubies, and when above 5 carats exceed in value, weight for weight, diamonds. The Spinel ruby is the commoner jeweller's stone, which is of much less value, specific gravity and hardness, non-dichroic, and forms a cubical crystal.

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