Gemstones Tools

Emerald

Emerald octagon cut
(em-er-ald)

12th c.; gr. smaragdos, sem. barequeth; sansk. maragdam

Precious stone of the beryl family with an attractive green color
Color
Medium-light to medium-dark tones of green
Family
Beryl
Chemical composition
Be3Al2(SiO3)6
Crystal system
Hexagonal
Hardness (Mohs scale)
7,5 - 8
Specific gravity
2,71 ±0,04
Refractive index
1,577 - 1,583 -0,012 +0,016
Birefringence
0,005 to 0,009
Optical character
Uniaxial -
Chanthaburi

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