These sterling silver cufflinks are inlaid with a matrix of iridescent white opal. The rainbow of fire is produced by the diffraction of white light through a microstructure of silica spheres. Each size sphere reflects light of a different wavelength. Handcrafted by our London silversmith, and hallmarked for a guarantee of purity, they will appear to flicker and change with every movement of the wearer. .75" long.