one-of-a-kind! sterling silver & australian opal i highly recommend sizing up a half to full size with this ring. wide ring bands will feel tighter than a more traditional ring band. ring size: us 6.75 (fits best on us size 5.75-6.25) please make sure you measure your ring size as i cannot resize this ring. handmade be me, in my austin, tx studio. you may see small marks & imperfections. or as i like to call them, wabi-sabi marks.