Rubies that display asterism are cut en cabochon to stars and are called Star Rubies which are exceptionally beautiful and expensive.

Sapphires coloured by chrome, are called 'rubies' - the king of the gemstones In the fascinating world of gemstones, the ruby is the undisputed ruler.
For thousands of years, the ruby has been the most valuable gemstones on Earth.It has everything a precious stone should have: magnificent colour, excellent hardness and outstanding brilliance. Fine Rubies are extremely rare.

Top-quality Star Rubies are extremely rare. Beauty, magnificent colour, transparency, are the main features. Color and asterism determines the value of a Ruby. Highly saturated medium or dark medium tones are best. Sri Lanka : is well known for the finest quality sapphires, and the largest sapphires in the world. See list of World Famous Gems