I don’t know who made this but the style and technique are similar to Taxco’s Mexican Pluma Azteca work. The ring is sterling, marked only .925 inside. The design is a multicolored resin poured in and around the silver. Please see all the photos that describe the piece. A size 8.5, this can’t be sized as the resin set can’t be removed. The top or front of the ring measures just over an inch wide by 3/4″ tall. The word unique gets overused these days but this piece truly is unique.