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- Facet:
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One of the flat refined surfaces cut on a gemstone
that allows the cut stone to sparkle and reflect light. Diamonds,
emeralds, sapphires, and also rubies are normally faceted.
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- Fire:
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Fire in a stone refers to the streaks and even
flashes of brilliant color(s) seen when the stone is rotate or enthused
in a natural or artificial light source. Opals are noted for their
fire.
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- Freeform:
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A stone engrave in an unusual or non-calibrated
shape.
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- Feldspar:
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Feldspar is derivative from the German Fled, field,
and Spat, a rock that do not contain ore. Feldspathic refers to materials
which contain feldspar.
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