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Lapis usually forms in crystalline marble
through the geological process of contact..
Onyx is black and white banded agate
(cryptocrystalline or chalcedony quartz). It should no..
Tourmaline varies in transparency and
colour to a considerable extent. Crystals of tourmali..
Pearls are organic gemstones that are
formed by shelled molluscs; mainly bivalved oysters a..
Ruby is one of the highest
valued colored gemstones, in fact, large rubies can fetch higher..
The Romans admired moonstone and believed
that it came from the rays of the moon made solid..
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