A ruby is a precious gemstone that is usually a deep, clear red. It is often used in jewelry and is valued for its rich color and hardness.
From Old French *rubis*, from Latin *rubeus* meaning 'reddish' or 'red'. The root is related to Latin *ruber*, meaning 'red'.
Rubies and sapphires are actually the same mineral—corundum—with different colors; we just give the red ones their own special name. In ancient times, people thought rubies had life inside them because of their glowing red color, almost like a captured flame. Gem names are really old attempts to explain colors that felt magical.
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