Uh? Jewellery and aluminium oxide????

Aluminium, or aluminum, is a silvery-white, soft, nonmagnetic, ductile metal. By mass, aluminium makes up about 8% of the Earth's crust; it is the third most abundant element after oxygen and silicon, and the most abundant metal in the crust. Now, what does aluminium have to do with jewellery, you may wonder. Well, another word for aluminium oxide is "corundum," which is commonly known as "sapphire."

Sapphire is typically blue in colour, but natural "fancy" sapphires also occur in yellow, purple, orange, and green hues. The only colour that sapphire cannot be is red—because red-coloured corundum is called ruby.

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