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- Labradorite
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A type of translucent or semi-transparent
feldspar which displays strong iridescence
(labradorescence).
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- Lapidary
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Lapidary is the art of wounding gemstones.
A lapidary is one who cuts and then polishes stones.
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- Luster
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A stone's luster is its
glow or sometimes sheen, the result of the way it reflects
light. Luster is needy on both the stone's surface (polish)
and the deep index of the mineral.
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- Lapis Lazuli
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Top quality lapis is a burly blue, sometimes
with a hint of violet. The value of lapis decrease with the
presence of white patches (calcite), but little veins of pyrite
could increase the value (presence of pyrite is often
a personal preference).
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