Yellow and green is the most common of all tourmaline color varieties, but emerald-green is much rarer and more valuable. Indeed, until the 18th century it was often confused with emerald.

Emerald-green stones are found in Brazil, Tanzania, and Namibia; fibrous yellow material occurs in Sri Lanka.

Chemical Composition: 

Complex borosilicate

Crystal System / Forms: 

Trigonal

Hardness: 

7.5

Specific Gravity: 

3.06

Lustre: 

Vitreous

Refractive Index / Birefringence: 

1.62-1.64 / 0.018

Sources: 

Brazil, Tanzania, Namibia and Sri Lanka.

Cuts & Uses: 

Brilliant, Mixed.