I purchased this at a Cartier boutique in Singapore this fall. I wore it for a short time, but I'm not particularly attached to it, so I'm selling it. Quote from the official website: Collection Description Cartier has transformed the everyday form of a nail into the "Juste un Clou" jewelry. Clean lines, a clear form, perfect proportions, and refined details. This is an icon of Cartier design, created for Cartier New York in the 1970s. I forgot the box, etc., and the card at the hotel, so I will only be shipping the item itself. If you are concerned, please use the authentication service. Size: 56 (Japanese size 16) Material: - 18K AU750 Pink Gold - 22 diamonds (brilliant cut) Please check the official website for details. It is still listed there. Reference price: Approximately ¥800,000 (tax included) (calculated in Singapore dollars, including tax) The retail price in Japan is ¥764,500 (tax included). The market price in Japan for items in similar condition is ¥540,000 - ¥570,000 (tax included). I think this ring is not often seen on the used market yet. If you are interested, please feel free to comment.