Ruby gemstones

Ruby gemstones

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Caption: Ruby gemstones. Rubies are a red variety of the mineral corundum (aluminium oxide). It is the second hardest mineral after diamond, rated 9 out of 10 on the Mohs scale. Artificial rubies are used in industrial lasers and also in analogue watch mechanisms. Inclusions of the mineral rutile (titanium oxide, not seen) cause a six- pointed-star light effect (asterism) to form star ruby.

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Keywords: aluminium oxide, blurred, corundum, cut, earth science, gem, gems, gemstone, gemstones, geology, many, mineral, multiple, natural, out of focus, polished, red, rubies, ruby, stone, stones

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