An uncomplicated, timelessly beautiful gemstone, popular in the times of the ancient Greeks and Romans as the “stone of rhetoric”. Its noble, subtly pervasive light blue makes it eminently suitable for jewellery.
Formula: SiO2 + water
Hardness: 6 – 6.5
Density: 2.58 – 2.63 g/cm3
Refractive Index: 1.530 – 1.548 DR: 0.008 – 0.010
Color: Greyish – blue
Countries of Origin: Brazil, Namibia, Mexico