A gif from a owner of a local jewelry store in Sri Lanka when I worked here about four years ago Perfect gloss as picture (the 1st pic is under warm light, the 2nd pic is under cold light)

Moonstone and Silver

--------from Mr Google----------------------- Moonstones from Sri Lanka, the classical country of origin of the moonstone, shimmer in pale blue on an almost transparent background. Specimens from India feature a nebulous interplay of light and shadow on a background of beige-brown, green, orange or brown. These discreet colours, in connection with the fine shimmer, make the moonstone an ideal gemstone for jewellery with a sensual, feminine aura. This gemstone was very popular once before, about a hundred years ago at the time of Art Nouveau. It adorns a noticeably large number of the jewellery creations of the French master goldsmith René Lalique and his contemporaries, mainly to be found in museums and collections today.

find more details :http://www.gemstone.org/gem-by-gem/english/moonstone.html