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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

I found a beautiful rose quartz stone in the right size for the right price.

Posted By Calico9999 in February, 2019

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Overall Rating -> 10

Gemselect is o.k the prices are pretty good, but the shipping prices really suck, one time I order from them and order got lost or never came, but they were good about fixing the problem and rectifying the situation, the stones and good, and the ones that come in the mail, look just as pictured on the website, or all it's not bad and its were I go to get my stones.

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Source: Bizrate

Overall Rating -> 10

Perfect experience. Pictures were accurate, selection was easy to maneuver. Product arrived as ordered.

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Overall Rating -> 9

Easy to shop through gemselect and will look there for future purchases.

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Source: Bizrate

Overall Rating -> 10

good value

Posted By Don in February, 2019

Source: Bizrate

Overall Rating -> 10

It was super easy to browse all the gemstones and find exactly what you wanted. The prices were great and the checkout process was smooth. Seems like a great site, will definitely come back to find more in the future.

Posted By JMWatch Guy in February, 2019

Source: Bizrate

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Buy Sillimanite Gems

Oval Green Sillimanite

Oval Yellow Sillimanite

Oval Brown Sillimanite Cat's Eye

Oval Green Sillimanite

Oval Gray Sillimanite Cat's Eye

Oval Brown Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Round Gray Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Cushion Yellow Sillimanite

Oval Brown Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval Gray Sillimanite Cat's Eye

Round Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Brown Sillimanite Cat's Eye

Oval Green Sillimanite

Oval Yellow Sillimanite

Oval Green Sillimanite