The four most precious gems in the world: diamond, ruby, sapphire and emerald.

The rarest gem in the world:

Aluminium-boron-zircon

Sri Lankan blue xonotlite

xonotlite

Silicone-boron magnesite

Jeremejevite boehmite

Mafic purple garnet

Taaffeite

Mafic taffeta

Benitoit blue cone mine