This 100% natural Australian Boulder Opal pendant necklace is set in solid sterling silver. The stone displays ocean-blue and electric-blue flashes that shift as it catches the light, with a wavy cream and brown ironstone matrix on one side, that shows the earthy origin of the gem. It is set in a secure, polished bezel with an open-back design that reveals the natural ironstone backing. The pendant comes on a premium sterling silver box chain made in Italy. Hallmarked "925" on the pendant bail, "925", "ITALY" on one side of the chain connector and maker's mark "" on the other. In excellent structural condition. The stone features minor, natural surface pits and texture variations inherent to raw boulder opal matrix rock. These are completely organic, entirely surface-level (not deep cracks), and only visible at specific angles, giving the piece its unique character. The pendant is approx. 21mm long x 12 mm wide (excluding bail).