Ruby

Posted on Ιούν 30, 2012 in Gemology | 0 comments

Ruby is an aluminum oxide, a variety of corundum; it occurs in medium to dark tones of red and violetish-red to brownish-red Varieties Star...

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Sapphire

Posted on Ιούν 30, 2012 in Gemology | 0 comments

Sapphire is an aluminum oxide. Its colour varies from very light to dark blue to violetish-blue, bluish-green, yellow, slightly...

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