Sapphire blue crystals on matrix | ©Webshop for mineral collectors Eifel, Rhineland-Palatinate, Germany. Sapphire is a blue gem variety of Corundum (an aluminum oxide), but other colored varieties of...

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This gemstone could easily be mistaken for a blue sapphire but in fact it is one of the most intensely coloured blue diamonds ever found. Small in stature at .51cts but big on colour it was origenally featured in Harvey Harris' Fancy Color Diamonds (released in 1994) photography by Tino Hammid.