Gorgeous london blue topaz genuine gemstones 6mm wide are set in a handcrafted bezel made in sterling silver. The width of the bezel measures a tad over 1/4 inch at about 7 mm wide with the bezel setting.    Can be made with many other birthstones as well. Materials: Natural Genuine London blue topaz gemstone permanently heat treated for coloring, and recycled sterling silver metal. Made to Order - Please allow 10-14 days for this item to be handcrafted before it ships out.