925 sterling silver diamond cut ring with a gorgeous faceted round solitaire blue topaz stone. The stone set in the middle measures 3/16 inch wide. It is available in sizes 5, 6, 7, 8, and 9. Although frequently associated with golden yellow as well as blue, it can be found in a variety of colors, including colorless. Measuring 8 on the Mohs scale, topaz is a very hard and durable gemstone. It is one of the birthstones for November.