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Sapphire
Sapphire, sister to ruby, is known in the mineral world as corundum,
which is a crystal structure composed of aluminum oxide. On
the Mohs scale of hardness, sapphire ranks 9, the highest in
the gem world after diamond. It is considered very durable,
a great choice for rings and bracelets. The finest sapphire
colour is a rich, velvety cornflower blue. Sapphire ranges in
colour from various blues to violet, green, yellow and orange.
Sapphire is the birthstone of September.
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