Moonstone, with its mysterious white or blue sheen, is one of the most familiar gems from a large group of minerals called "Feldspars". They're actually the most abundant mineral in the crust of the earth.

Moonstone is the most popular member of this group. Its blue or white sheen is caused by the presence of tiny crystals arranged in layers in the feldspar itself.

The main sources for fine moonstone are Sri Lanka and Burma, as well as Canada, Brazil, California and Australia.

Moonstone is still considered a sacred gem in India and it's been used in jewelry there for centuries.

Along with the Pearl, Moonstone is an birthstone for the month of June.