American Art Deco ring set with a large gem quality emerald step-cut aquamarine (approx. 15 carats by calculation with the dimensions of 17mm x 13mm x 10mm depth) and 10 round cut diamonds (approx. half of a carat TW) all set in a platinum “Bow tie” design mount, signed: FFF framed with a triangle facing in on either side (maker’s mark), Plat (platinum mark), c.1935