This appears to be my week for mysterious jewellery. This self-described (accurately) cool cuff by Goph Studios is mixed metal in what appears to be oxidized sterling silver and gold. It looks to me like Japanese shakudo work. It’s not the same as mokume-gane but it does remind me of that technique as well. Some of their other cuffs found here have that vibe, though. The piece is accented with diamonds.

Contact the designer for information on pricing and availability.