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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 -> 9

Site was recommended to me by my gemology professor. Based on what I’ve seen gemselect offers good quality stones for a large range of prices

Posted By Lynn in April, 2021

Source: Bizrate

Overall Rating -> 10

Ive been shopping here many times before, so navigating around was easy. I am accustomed to the quality of the items and that's the main reason I come here. When I need non heated stones I know I can count on GemSelect being authentic. I trust them because I double check their quality. And never had problems with them. And yes I do recommend shopping there to some of my clients who are "less knowledgable" of industry. GemSelect is so user friendly they're great for beginner gem shoppers!

Posted By Konstantin Marchenko in April, 2021

Source: Bizrate

Overall Rating -> 10

All has been great so far, now to wait and hopefully the items are what are expected.

Posted By Bek in April, 2021

Source: Bizrate

Overall Rating -> 10

Well fell in love with the site right away ordered two many items I knew I would return a few. Decided I wanted to invest in a sapphire emerald or ruby after more research. The diamonds that I received we just stuck together just ordered one more I will have 10 in all diamonds two yellow six white. I'm so very happy I didn't know what I was going to keep and definitely diamonds were winner.

Posted By Kaitlin m in April, 2021

Source: Bizrate

Overall Rating -> 9

good choice and quaity, would pass on info to others

Posted By Hunstman in April, 2021

Source: Bizrate

Overall Rating -> 9

I like quality, selection, no charge tax and good shipping.

Posted By Thea in April, 2021

Source: Bizrate

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Oval Yellow Sillimanite

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Oval Yellow Sillimanite

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Oval Yellow Sillimanite

Oval Yellow Sillimanite

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Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

About Sillimanite

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