Simple, yet elegant - this necklace features a natural sardonyx gemstone with a dramatic black & white striped matrix accented with a hammered solid pewter circle dangle. Sardonyx is a type of agate formed when minerals form in between strips of black onyx giving the stone a banded, "striped" appearance. MEASUREMENTS: Total pendant length: 2-3/4" from top of silver niobium (hypoallergenic) wire bail and 1" at widest point of stone. It comes on an 18" inch stainless steel chain with lobster claw closure.