Tourmaline Cabs, Round, 4.5mm

The Tourmaline group refers to a number of related species and varieties. In 1703 the Dutch imported it from Sri Lanka to Western and Central Europe where it gained its name 'Turmali' which means 'stone with mixed colours'.  

These cabochons have a smooth, polished surface.  

Shape: Round

Size: 4.5mm

Weight: 0.10grams

Colour: Mixed colours of glassy green, blue, pink and aqua

Moh's hardness: 7-7½  

Density: 2.82-3.32

Cleavage: Indistinct

Refractive index: 1.614 - 1.666

Dispersion: 0.017