90% of a certain version of the world's rubies come from Myanmar (Burma). There are many other ruby sources in the world such as Sri Lanka and various places in Africa. Only in terms of quality Mogok rubies are best. The red stones from there are prized for their purity and hue. Thailand buys the majority of Myanmar's gems. The ""Valley of Rubies"", the mountainous Mogok area, north of Mandalay, is noted as the original source of ruby including the world's finest "pigeon's blood" rubies as well as the world's most beautiful sapphires in "royal" blue.