This 2-stack line & diamond round or square ring set is made up of two rings including 1 thick (6mm) line ring with a 1.0mm diamond and 1 thick (2.5mm) silver ring with a 1.0mm diamond. This stack is available in sizes 5.0-13.0, including half sizes. Special note: Because of the width of our stack ring sets, it is recommended to buy a stack that is approximately a half to a full size larger than your normal ring size. Materials: Sterling silver (.925), oxidized sterling silver, and two lab-created diamonds. All materials are hypoallergenic. We hand carve and oxidize the line on this ring. The oxidation is protected within the carved line and therefore better preserved over time. This ring set is handmade in our Upstate New York production studio.