Green Tourmaline

Green tourmaline occurs in a wide range of shades and different price points to suits most people.  The most commonly used green tourmaline in the jewellery trade are the dark olive or bottle green shades being both the most plentiful and cheapest variety.  The most renowned and comparatively expensive form of green tourmaline are the chrome tourmalines being similar in colour to that of tsavorite garnet and some emeralds.  Other curious forms of green tourmaline include bluish-green colours, yellowish-green colours, some that have both yellowish-green and bluish-green colours mixed within the same stone .... others again are an unusual crisp, light bluish green reminiscent of spearmint or sea water.  These varied shades of green tourmaline are mined in Madagascar, Brazil, Afghanistan, Pakistan, and some East African countries.

Mohs’ Hardness: 7-7.5
Specific Gravity: 3.00-3.20
Refractive Index: 1.619-1.650
Birefringence: 0.014-0.021
Optic Sign & Character: Uniaxial Negative
ICA Code: N or E
Treatments: Heating
Incidence: Occasionally
Purpose: To lighten colour
Durability: Fair to good
Special Care: Avoid thermal shock
Synthetics: None
Possible Imitations: Glass, CZ, synthetic emerald, synthetic spinel, synthetic corundum