Hammered Squarely in Black! This 9 millimeter (9mm) Cobalt Chrome Wedding Ring features a hammered and brushed inlay of Black Zirconium. Also, the squared design not only keeps it from spinning...but it makes it totally cool! Cobalt Chrome is a very popular, new fine metal for wedding rings. Cobalt looks like shiny platinum, yet has extreme hardness. Your Cobalt Chrome metal will serve you well. It will stay beautiful & won't tarnish. Cobalt Chrome is also a hypoallergenic metal making it a great alternative metal option for your fine jewelry wedding ring.   Black Zirconium has quickly become a popular metal for wedding rings. Our Zirconium is very hard and durable, zirconium stand the test of wear. The zirconium metal begins as bright silver metal. We then use a slow, controlled process of intense heat to produce this permanent black metal. Once the black zirconium is polished, heated and cooled, we can mill grooves and patterns (if applicable) that gleam in the silver zirconium color.      **PLEASE READ** No Returns / No exchange. Lashbrook DOES DO NOT SIZE-EXCHANGE. Please research your ring size with comfort-fit sizing gauge.