From medieval times till the end from the 19th century green sapphire was referred to as oriental peridot. Many sapphires that appear green actually consist of very fine alternating bands of blue and yellow sapphire, which may be visible under a microscope.

Green sapphires are found in Thailand, Sri Lanka, and Australia (Queensland and New South Wales).

Chemical Composition: 

Aluminium oxide

Crystal System / Forms: 

Trigonal

Hardness: 

9

Specific Gravity: 

4.00

Lustre: 

Vitreous

Refractive Index / Birefringence: 

1.76-1.77 / 0.008

Cuts & Uses: 

Brilliant, Mixed.