Tanzanite Cut Stone, Round, 2.3 - 2.5 mm

Tanzanite was first introduced by the New York jewellers Tiffany & Co.  Due to its colouring, it is often mistaken for Iolite, Amythest, Sapphire and Lazulite. In natural light, it is ultramarine to sapphire blue with soft transparency to it, however, in artificial light, it appears more amethyst violet. 

Shape: Round

Size: 2.3 TO 2.5mm

Weight: 0.01grams

Colour: Mix of transparent blue, lilac and violet

Colour of streak: White

Moh's hardness:  6½ - 7

Density: 3.35

Cleavage: Perfect

Refractive index: 1.691 - 1.700

Dispersion: 0.030 (0.011)