Opal, considered the ''queen of gems,'' can flash patterns of color representing every hue of the rainbow. Believed by ancient people to actually contain fire, Opal has long been ascribed many mystical and healing properties. Geologically, Opal is more than 60 million years old. The rainbow of fire is produced by the diffraction of white light through a micro-structure of silica spheres. Each size sphere reflects light of a different wavelength. This sterling silver jewelry piece is set with an inlay of a matrix of iridescent white opal. Handcrafted by our London silversmith, and hallmarked for a guarantee of purity, it appears to flicker and change with every movement of the wearer. Choker 16''. Click Here for more information regarding British hallmarks. Click Here for tips on caring for your sterling silver jewelry.