Top 10 Rarest Gemstones in the world

6. Musgravite

Member of the Taaffeite family of minerals, Musgravite is a rare oxide gemstone. It is highly sought after by collectors. Musgravite was discovered in the Musgrave Range of South Australia in 1967. It crystallizes in the trigonal system. In addition, there are only eight known in the world.

Musgravite costs around $35000 per carat. It’s known to be difficult to distinguish from taaffeite. Its main ingredients are Beryllium, Magnesium and Aluminium.