This is a Light Green Tourmaline. It is sparkling light Green in color. The gemstone is beautiful even though it has visible inclusions. This natural gem has not been treated. It is a loose gem. Green Tourmaline Oval 7.33ct 14.5x10mm.
A very nice green Tourmaline Gemstone
Color: wide color range, green, blue, yellow, pink, red, brown, colorless. Bi-color is common.
Hardness: 7 - 7.5
Refractive index: 1.61 - 1.66
Density: 3.01 - 3.25
Chemical composition: (NaLiCa)(Fe11MgMnAl)3Al6((OH)4(BO3)3Si6O18)
Crystal structure: trigonal
Origins: Brazil, Madagascar, Namibia, Zambia, Sri Lanka, Russia, USA, Afghanistan.
Tourmalines exist in different colors and are known for their bi-color or even tri-color varieties. The most expensive color varieties are intense green, blue and red.Heat treatment is occasionally applied to enhance the color of green or blue crystals. Yellow stones could be irradiated to improve their color or clarity.