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The
current featured stone: |
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Taaffeite |
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| Refractive Index:
1.720 |
Crystal Structure:
Hexagonal |
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| Hardness: 8 -
8
1/2 |
Specific Gravity:
3.6 |
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Chemical
Composition: BeMgAl4O8
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Occurrences:
Sri Lanka, Tanzania |
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We make no secret of our love for gemstone
rarities, so it seems appropriate that we would choose Taaffeite to be a
profiled stone. Pronounced TARF-ite, the stone is named for its
discoverer, Count Charles Richard Taaffe (1898-1967) who first came across a
faceted stone (one of the few gems to be discovered not as rough, but as a
faceted stone) while sorting a parcel of Spinel in 1945. For many years
after, Taaffeite was known only in a few samples and became famous as one of the
rarest gems in the world.
The confusion between Spinel and Taaffeite is an
understandable one, the two gems share very similar gemological properties.
The crucial difference being that Taaffeite is doubly refractive while Spinel is
singly refractive; the gemologist is able to see pleochroism in Taaffeite.
Moreover, the color range is also similar for the two gems, Taaffeite usually
being found is fairly unsaturated (think grayed out) shades of mauve and
lavender. Unusual examples have been found both colorless and in deeper,
more attractive reds and purples. See the photos below for some examples
of Taaffeite's color range.
Sri Lanka remains the primary source for
Taaffeite where it is found in the island's famed alluvial deposits. With
more aggressive mining and increased gemological awareness in East Africa more
Taaffeites have been coming from Tanzania in recent years. Naturally this
means slightly greater availability and more attractive prices for collectors
and admirers. While no longer the extreme rarity that it once was,
Taaffeite remains an extremely rare gem material. Among this select group,
Taaffeite is rarer still for its durability; most collector's stones require
care in handling and are of very limited use in jewelry. Taaffeite, with
it's hardness between that of Chrysoberyl and Topaz could easily be set in all
types of jewelry.
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