Now THIS is a cocktail ring!
I found this fabulous washer at an antique market, and I love the strange cup-ness of it; the actual depth of the little washer is 3/8", and the vintage pearly button is set into it. Also, the rusty pattern on the top of the washer is super pretty. The band of the ring is made from a piece of rusted metal and measures about 3/8" wide.
The whole ring is coated with resin, which protects the rust and your hand when you wear it, and gives the piece a high gloss.
The face of the ring, the washer, is about 1.75" in diameter, and the band is about a snug size 8. It can be adjusted a bit in size, so let me know if you need. No charge for re-sizing.