I made this ring form a 3mm, 0,12 in, black acrylic sheet, carved, sanded and polished by me, as the acrylic, also cut.
The aluminium band goes from 60mm circum, 11USA, and it´s adjustable.
The piece is riveted to the ring, with a cold join.
I can make this ring on other colors, you can see them here >>> http://www.pulguinha.etsy.com
Have any questions? Contact the shop owner.