Rough tourmaline - for faceting or rough gemstone jewelry - 1.640 ct - bicolor

Certificate: RO-TOUR025BG-002-441

Gem Type: Tourmaline

Weight: 1.640 Carat

Shape: Rough

Size: 18.0 x 4.2 x 2.0 mm.

Color: 1 side greyinsh greenish white other side deep to bright green

Clarity: Transparent

Luster: N/A

Treatment: Unheated Untreated

Birefringence : 0.020
Crystallography : Hexagonal (trigonal)
Dispersion : 0.017
Luster : Vitreous
Hardness : 7

Find the online certificate here