18 Karat bi-metal turned edge ringThis ring is made of bi metal which is sterling silver with. 007 of 18 karat gold fused to the silver. This is about 1000 times thicker than an average plated piece. I turn the edge which exposes the silver on the top of the ring blacken it and you get a great combination of colors. Because silver naturally turns black and gold stays gold this could look like it does forever