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You Selected (280): Sillimanite Cat's Eye Sillimanite, Sillimanite Clear All
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ID: 4117931 pcs
thumb image of 0.6ct Oval Facet Green Yellow Sillimanite (ID: 411793)
0.64 ct Sillimanite
5.3 x 5 mm
$ 22.40
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ID: 4117224 pcs
thumb image of 4.4ct Oval Facet Green Yellow Sillimanite (ID: 411722)
4.41 ct Sillimanite
7.8 x 6 mm
$ 154.35
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ID: 4118226 pcs
thumb image of 4ct Oval Facet Green Yellow Sillimanite (ID: 411822)
4.04 ct Sillimanite
6.1 x 4.2 mm
$ 141.40
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ID: 4117901 pcs
thumb image of 0.8ct Oval Facet Green Yellow Sillimanite (ID: 411790)
0.79 ct Sillimanite
6.7 x 5.1 mm
$ 27.65
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ID: 4692401 pcs
thumb image of 5.3ct Oval Cabochon Greenish Brown Sillimanite Cat's Eye (ID: 469240)
5.34 ct Sillimanite Cat's Eye
11.8 x 8.1 mm
$ 38.92
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ID: 4118185 pcs
thumb image of 4.3ct Oval Facet Green Yellow Sillimanite (ID: 411818)
4.31 ct Sillimanite
7 x 5.1 mm
$ 150.85
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ID: 4115311 pcs
thumb image of 1.4ct Oval Facet Green Yellow Sillimanite (ID: 411531)
1.35 ct Sillimanite
8 x 6.1 mm
$ 30.47
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ID: 4719061 pcs
thumb image of 1.3ct Oval Cabochon Grayish Brown Sillimanite Cat's Eye (ID: 471906)
1.34 ct Sillimanite Cat's Eye
7.9 x 5.8 mm
$ 4.02
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ID: 4117254 pcs
thumb image of 3.5ct Oval Facet Green Yellow Sillimanite (ID: 411725)
3.48 ct Sillimanite
7 x 5.2 mm
$ 121.80
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ID: 4118174 pcs
thumb image of 4.8ct Oval Facet Green Yellow Sillimanite (ID: 411817)
4.75 ct Sillimanite
7.1 x 5 mm
$ 166.25
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ID: 4117214 pcs
thumb image of 3.4ct Oval Facet Green Yellow Sillimanite (ID: 411721)
3.35 ct Sillimanite
6.9 x 5 mm
$ 117.25
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ID: 4739971 pcs
thumb image of 1.2ct Oval Cabochon Smoke Sillimanite Cat's Eye (ID: 473997)
1.18 ct Sillimanite Cat's Eye
8 x 5.7 mm
$ 3.54
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ID: 4116222 pcs
thumb image of 3.3ct Oval Facet Green Yellow Sillimanite (ID: 411622)
3.33 ct Sillimanite
8 x 6.1 mm
$ 116.55
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ID: 4118195 pcs
thumb image of 5.5ct Oval Facet Green Yellow Sillimanite (ID: 411819)
5.52 ct Sillimanite
7.1 x 5.1 mm
$ 193.20
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ID: 4117174 pcs
thumb image of 3.9ct Oval Facet Green Yellow Sillimanite (ID: 411717)
3.89 ct Sillimanite
7.2 x 5.2 mm
$ 136.15
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ID: 4112792 pcs
thumb image of 5.1ct Oval Facet Green Yellow Sillimanite (ID: 411279)
5.09 ct Sillimanite
10.1 x 8 mm
$ 114.88
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ID: 4101974 pcs
thumb image of 4.5ct Oval Cabochon Smoke Sillimanite Cat's Eye (ID: 410197)
4.50 ct Sillimanite Cat's Eye
7.4 x 4.9 mm
$ 16.29
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ID: 4118205 pcs
thumb image of 5.2ct Oval Facet Green Yellow Sillimanite (ID: 411820)
5.18 ct Sillimanite
6.6 x 4.9 mm
$ 181.30
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ID: 4118113 pcs
thumb image of 3.2ct Oval Facet Green Yellow Sillimanite (ID: 411811)
3.23 ct Sillimanite
7.3 x 5.1 mm
$ 113.05
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ID: 4117194 pcs
thumb image of 4.1ct Oval Facet Green Yellow Sillimanite (ID: 411719)
4.11 ct Sillimanite
8 x 6 mm
$ 143.85
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ID: 4112972 pcs
thumb image of 4.9ct Oval Facet Green Yellow Sillimanite (ID: 411297)
4.94 ct Sillimanite
9.1 x 7.1 mm
$ 111.50
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Sillimanite
Sillimanite is an aluminum silicate, related to both andalusite and kyanite. In fact these three minerals are polymorphs - they share the same chemical composition but different crystal structures.

Sillimanite is named after the American chemist Benjamin Silliman (1779-1864). Silliman was one of the first American professors of science and taught at Yale University.

Sillimanite gems may show a cat's eye and be cut en cabochon, or they may be faceted, transparent gemstones. The colors of sillimanite include colorless, grayish-white, green, bluish and brownish. A fibrous variety of sillimanite is traded as "fibrolite". Some sillimanite gemstones show pleochroism, which means that several colors may be exhibited in a single gemstone depending on the viewing angle.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart