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About 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

The selection of gems they had are great and the prices are fair. It is easy to purchase.

Posted By Mmorric in March, 2021

Source: Bizrate

Overall Rating -> 10

All good

Posted By Brandyn in March, 2021

Source: Bizrate

Overall Rating -> 8

I’m excited about the stone, hoping it’s beautiful in real life. We’ll see when I get it, if it’s great I’ll buy more from this company

Posted By Brooker in March, 2021

Source: Bizrate

Overall Rating -> 10

Loved all my items def will buy again and def will share the company site

Posted By TEDDY in February, 2021

Source: Bizrate

Overall Rating -> 9

Love the selection of gems, prices are fair

Posted By Cj in February, 2021

Source: Bizrate

Overall Rating -> 9

Gem select has a great selection of Gems, very defined pictures of item and easy process to filter down selection including, gem, color, type, size and weight.

Posted By KingFarm in February, 2021

Source: Bizrate

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Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval White Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval White Sillimanite Cat's Eye

Oval White Sillimanite Cat's Eye

Oval Golden Sillimanite

Oval Gray Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Gray Sillimanite Cat's Eye

Oval White Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Oval White Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval White Sillimanite Cat's Eye

Oval White Sillimanite Cat's Eye

Oval Yellow Sillimanite

About Sillimanite

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