Tanzanite, also known as the zestier, was marketed by the
American jeweler Tiffany. His intense blue dotted purple makes it very similar
to sapphire or polite. Its rarity, combined with the high publicity it was the
object, make a stone whose value is quite high. His only deposits are located
in Tanzania
Characteristic
Chemical
Composition: Calcium silicate and aluminum
Color:
Blue-violet
Hardness: 6.5
Specific gravity:
3.11 - 3.40
Refractive index:
1.69 - 1.70
Dispersion: 0030
Polychrome:
Purple, blue, brown
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