18K solid yellow gold eternity spacers with clean crisp brilliant cut Ethiopian Opal, opulent findings for you high-end gold jewelry! Size: (3.8mm Diameter) (1.8mm Thickness) (1.8mm hole diameter)Opal Size: 1.50mmWeight: Approx. 0.23 gram/pieceMATERIAL: 18k Solid Yellow Gold, Genuine Opal