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Ruby
Ruby is the usual name for transparent red corundum . On this page, we will often use the word corundum to include ruby and sapphire , because of their shared characteristics.
Ruby is red or pink. Blue or any other colour of corundum is usually called sapphire.

Corundum
Corundum is the mineralogical name for aluminium oxide.

Colours
Corundum can be colourless, red, pink, red, black, brown, orange, yellow, green, indigo, violet, or mauve. Red corundum and most pink corundum is called ruby, all other colours are called sapphire, usually with the colour specified as a prefix to the word ruby, for example, yellow sapphire.

For more information on ruby please see our ruby information page.

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