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Rubis sous UV. fr cristaux de corindon var rubis sous lumire UV Luc Yen Mine Luc Yen Yenbai Yen Bai Province Vietnam crystals of corundum var ruby under UV light Luc Yen Mine Luc Yen Yenbai Yen Bai Province Vietnam own Parent Gry Ruby Calcite Fluorescent Ruby Taken with Nikon D
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