A Moonstone gemstone set in hammered silver with an open back created as a design feature NOT for purposes of adjusting the size, but it will fit two finger sizes e.g. an N or an O. 

Moonstone is an Orthoclase Feldspar formed from cooling magmas deep within the Earth As the magmas cooled at differing speeds so thin layers of the minerals Albite and Orthoclase formed . As these minerals have different reflective indexes light entering the stone is scattered  and diffused in many directions, creating the wonderful changes in colour, known as adularescence.

It is regarded by many cultures as the stone of femininity and is the birthstone for Cancerians. It may improve intuition and creativity ,provide a calming effect ..       

Ring size  N/O,     weight ; 5.8 grams         gemstone size:  1.4cm x 1cm