This is an authentic, pre-loved Pomellato piece. It's possible that there may be some gentle wear. 18-karat rose gold Smoky Quartz gemstones = approximately 4.00 ct. tw. Ring cannot be re-sized 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.