Thank you for viewing. - Material: Black Onyx, Silver - Brand: STUDIO TENTEN SHINOA BIJOUX - Size: Inner diameter is 1.8cm, so I think it's about size 16. I purchased it new and stored it in the included bag and wooden box, hardly ever using it. This is art jewelry with a plump form that suits adult women and is also somehow relaxing. The designer is said to be inspired by the world heritage sites they saw through their travels. They also have pop-up stores in places like Ginza Mitsukoshi. We are also waiting for your questions. #ring #onyx #blackonyx #blackonyx #powerstone #studiotenten