The Organic solitarire Collection it our CZ diamond simulate. 18K Yellow gold PVD plated stainless steel. Lobster Claw clasp. The CZ are all Czech Bohemia Crystal. Foiled and Bezel Set. Very Modern Round, Teardrop, Marquee These are all hand set and bezel Chunky setting CZ diamond Simulate quality. These are perfect as a single piece or stacked and layered. These are waterproof. Hand cut stones for detail Hand linked. The Chain is all 18 with extender and can be worn from 14 to 20 Waterproof Hypoallergenic Anti Tarnish