Silver tone necklace featuring an iridescent abalone shell pendant

This silver tone necklace features a circular pendant set with what appears to be an iridescent abalone shell cabochon, displaying a vibrant play of colour including blue, green, and purple tones. The shell is held within a contemporary open-back silver tone frame. The pendant is suspended from a silver tone snake chain which is secured by a lobster claw clasp. A 925 purity mark is stamped on the end tab of the chain.