Loose Sillimanite Gemstones for Sale - In Stock and ready to Ship ...

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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Gemstones A-Z

Buy Sillimanite Gems

1.38 ct Yellow Sillimanite, 8.1 x 6.2 mm Oval Cut From Sri Lanka

2.54 ct Yellow Sillimanite, 7.8 x 5.7 mm Oval Cut From Sri Lanka

1.61 ct Yellow Sillimanite, 8.1 x 6.1 mm Oval Cut From Sri Lanka

1.33 ct Yellow Sillimanite, 8 x 6 mm Oval Cut From Sri Lanka

4.88 ct Yellow Sillimanite, 9 x 7.2 mm Oval Cut From Sri Lanka

4.75 ct Yellow Sillimanite, 7.1 x 5 mm Oval Cut From Sri Lanka

2.6 ct Yellow Sillimanite, 8.1 x 6.1 mm Oval Cut From Sri Lanka

3.46 ct Yellow Sillimanite, 9 x 7 mm Oval Cut From Sri Lanka

2.61 ct Yellow Sillimanite, 8 x 6 mm Oval Cut From Sri Lanka

4.86 ct Yellow Sillimanite, 9.7 x 7.7 mm Oval Cut From Sri Lanka

1.69 ct Yellow Sillimanite, 8 x 5.9 mm Oval Cut From Sri Lanka

2.94 ct Yellow Sillimanite, 6.8 x 5.1 mm Oval Cut From Sri Lanka

2.82 ct Yellow Sillimanite, 8.1 x 5.9 mm Oval Cut From Sri Lanka

3.23 ct Yellow Sillimanite, 7.3 x 5.1 mm Oval Cut From Sri Lanka

2.47 ct Yellow Sillimanite, 8 x 6.1 mm Oval Cut From Sri Lanka

1.63 ct Yellow Sillimanite, 8.8 x 6.6 mm Oval Cut From Sri Lanka

4.32 ct Yellow Sillimanite, 9.1 x 7.2 mm Oval Cut From Sri Lanka

1.24 ct Yellow Sillimanite, 7.8 x 6 mm Oval Cut From Sri Lanka

2.03 ct Yellow Sillimanite, 9.8 x 7.7 mm Oval Cut From Sri Lanka

1.98 ct Yellow Sillimanite, 8.9 x 6.8 mm Oval Cut From Sri Lanka

2.78 ct Yellow Sillimanite, 7.1 x 4.9 mm Oval Cut From Sri Lanka

4.08 ct Yellow Sillimanite, 8.8 x 7.1 mm Oval Cut From Sri Lanka

1.98 ct Yellow Sillimanite, 6.9 x 5 mm Oval Cut From Sri Lanka

2.91 ct Yellow Sillimanite, 7.1 x 5.1 mm Oval Cut From Sri Lanka

1.58 ct Yellow Sillimanite, 8.1 x 6.2 mm Oval Cut From Sri Lanka

2.07 ct Yellow Sillimanite, 8 x 5.9 mm Oval Cut From Sri Lanka

2.35 ct Yellow Sillimanite, 10 x 7.7 mm Oval Cut From Sri Lanka

2.91 ct Yellow Sillimanite, 8 x 6.1 mm Oval Cut From Sri Lanka

4.57 ct Yellow Sillimanite, 8.9 x 6.9 mm Oval Cut From Sri Lanka

3.32 ct Yellow Sillimanite, 8.9 x 7.1 mm Oval Cut From Sri Lanka

3.39 ct Yellow Sillimanite, 8.8 x 6.7 mm Oval Cut From Sri Lanka

1.72 ct Yellow Sillimanite, 9 x 7.1 mm Oval Cut From Sri Lanka

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