All gem quality corundum, which are not red, are known as sapphire except Padparadscha, which is the second only variety of corundum, which is given its own name as Ruby being the first one. This green variety of sapphire contains fine alternating bands of blue and yellow sapphire.

Locations:

Green sapphire is found in Sri Lanka, Thailand and Australia.

Chemical Structure: Aluminum Oxide
Crystal Structure: Trigonal
Hardness: 9
Specific Gravity: 4
Refractive Index: 1.76-1.77
Colors: Light green to deep green to black.
Luster: Vitreous

Astrological Relevance:

Being sapphire, green sapphire is considered to be one of the birthstones for the month of September, which covers two zodiac signs: Virgo (August 22 To September 22) and Libra (September 22 To October 23).