About the brand: Italian traditions crafted in contemporary designs. 18-karat white gold Faceted Round-cut Diamond = approximately 0.15 ct. tw. Approximately 16.5in long 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.