About the brand: Italian traditions crafted in contemporary designs.. 18-karat white gold. Bead-set Diamond = approximately 0.23 ct. tw.; color = F-H; clarity = VVS-VS. Blue Topaz gemstones. Approximately 16.25in long. Lobster claw clasp closure. It is customary to treat most gemstones to achieve enhanced color and durability. Some of these treatments may not be permanent, and may require special care.. Please note: In product titles ct. tw. refers to the total carat weight of all diamonds and/or gemstones combined.