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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.

Certified Customer Reviews

Overall Rating -> 10

GemSelect has a wonderful well described selection that surprises me how quickly it ships.

Posted By Tim in December, 2019

Source: Bizrate

Overall Rating -> 10

They have the best selection of different gems and the prices and fantastic

Posted By Brandi in December, 2019

Source: Bizrate

Overall Rating -> 9

Very clear site. The photos and video make sure you know exactly what you are getting. I also appreciate all of the additional info. and definitions/explanations offered

Posted By NuthinClever in December, 2019

Source: Bizrate

Overall Rating -> 10

Working on a special anniversary gem collection for my wife, and was able to find almost everything on this one site. Having bought from yall before, this was a no-brainer on where to go for the right stones/buying experience.

Posted By ESP in December, 2019

Source: Bizrate

Overall Rating -> 10

Great products and very customer friendly. Will be purchasing again. Thanks!

Posted By Joe in December, 2019

Source: Bizrate

Overall Rating -> 9

You have a much wider variety of stones than other dealers. I come back for this reason: lots and lots of everything.

Posted By G in December, 2019

Source: Bizrate

Gemstone Information

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Buy Sillimanite Gems

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval White Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Oval Yellow Sillimanite

Cushion Yellow Sillimanite

Round Gray Sillimanite Cat's Eye

Oval White Sillimanite Cat's Eye

1 pc (avg. 0.89 ct) Gray Sillimanite Cat's Eye

Oval Yellow Sillimanite Cat's Eye

Cushion Yellow Sillimanite

Oval White Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval White Sillimanite Cat's Eye

Oval Yellow Sillimanite