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Lapis usually forms in crystalline marble
through the geological process of contact..
Tourmaline varies in transparency and
colour to a considerable extent. Crystals of tourmaline may b..
Tourmaline varies in transparency and
colour to a considerable extent. Crystals of tourmaline may b..
Ruby is one of the highest
valued colored gemstones, in fact, large rubies can fetc..
Blue topaz is the
state gemstone of the
US state of Texas. Naturally occurring ..
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