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cristol507 (25)

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Joined September 2017 Active 7 years ago

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cristol507 (25)in #steem • 7 years ago
What Causes the Colour of Gemstones?
here are a wide range of gemstones used in jewellery, with each having its own characteristic colour – or, in some cases, a range of colours. The origin of these colours has a…
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