This exquisite necklace showcases a Natural Australian Opal Doublet Pendant in Sterling Silver (Stamped 925), featuring opals of varying sizes?x6 mm for the center opal and 6x4 mm for the side opals. The adjustable length of 18 inches adds versatility. Classified as a genuine Natural Australian Opal Type 3, it boasts a composition of hydrated amorphous silica SiO2nH2O, with silicon dioxide spheres backed by Boulder Opal ironstone from remote areas in Queensland, Australia. The bonded layers prevent delamination, and the piece is guaranteed free of dyes and artificial color. Our international warranty covers all jewelry items, offering customization options upon request. Note that opals' dynamic play of color may not be perfectly captured online.