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. These sterling silver earrings are set with an inlay of a matrix of iridescent white opal, the gem of love and hope. Handcrafted by our London silversmith, and hallmarked for a guarantee of purity, they will appear to flicker and change with every movement. 1.25'' drop, posts. Click Here for more information regarding British hallmarks. Click Here for tips on caring for your sterling silver jewelry.