Rainbow Moonstone.
Why it is called moonstone? It is because of it light reflective qualities. Shimmering hues of blue and white similar to that of a full moonlit evening. We have more information about moonstone on our page about moonstone . We also feature some Labradorite which like moonstone is a feldspar. It was named after its state of origin - labrador. Its crystal like structure is composed chiefly of Sodium and calcium.
The rainbow moonstone is fairly easy to distinguish from its ordinary sister. You will see a greater depth of blue colour and in certain lights it can be seen to produce a small rainbow spectrum. It also has a more crystalline structure than the duller varieties.To look after your stone keep it away from prolonged exposure to the sun and try to avoid detergents of washing up liquids that can not only loosen the stone from its mount but also discolour it.