Labradorite Shield Ring, size 7
Blue labradorite and 925 Sterling Silver Shield Ring from Vaughn Nagel.
Stamped 925, VN
Labradorite can display an iridescent optical effect (or schiller) known as labradorescence. The term labradoresence was coined by Ove Balthasar Bøggild, who defined it (labradorization) as follows: Labradorization is the peculiar reflection of the light from submicroscopical planes orientated in one direction (rarely in two directions); these planes have never such a position that they can be expressed by simple indices, and they are not directly visible under the microscope.