This is a silver ring sampled after the Cartier Juste un Clou ring. I am selling it because I received it as a gift and have not used it. It has an S925 stamp, but the brand name is unknown. The size is about a size 12 (Japanese size), which would likely fit a woman's middle or index finger, or a man's ring finger. The original Cartier online site currently sells for around 220,000 yen, so this is recommended for those who want to try this design more casually.