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Whether it's understanding
gemological or jewelry terms in an
article you're reading or simply
gaining a greater understanding of
the world of jewelry and gemstones,
our Jewelry & Gem Dictionary is a
handy reference guide. And, unlike
most dictionaries, ours makes for
interesting reading all on its own!
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Z
ZAMAK
Zamak is a zinc alloy containing some aluminum
(3.9-4.5%) and copper (0.02-0.05%).
ZIRCON
Zircon (zircon silicate) is a lustrous gemstone that
comes in colors ranging from golden brown to red to
violet to blue. Pure zircon is colorless, but most
zircon stones are brown. Zircon stones can be
heat-treated to become blue or colorless; sometimes,
heat-treated stones revert to their original color.
Clear zircon is sometimes sold (intentionally or
otherwise) as diamond. It has a hardness of 7.5 and
a specific gravity of 3.90-4.71.
ZOISITE
Zoisite (Calcium-aluminum silicate) is a gray-green
mineral that occurs in cracks of igneous rock.
Zoisite has three known forms: anyolite (a green
matrix containing rubies), tanzanite (transparent,
blue-violet containing strontium), and thulite
(opaque pink crystals containing manganese). Zoisite
was named for the Slovenian mineral collector Baron
Sigismund Zois von Edelstein, who financed the
expedition that discovered Zoisite.
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