1939 Art Deco diamond ring in 14K

by Lisa
(Pennsylvania)

I inherited a 1939 engagement ring, and have been trying to do a little research on it. The only mark I can find is a small "S&D" stamp. I believe it was purchased in the Philadelphia area, but I don't know. It's 14K gold, and may have some white gold or platinum plating. It also has one large center stone, and two smaller stones on either side.