R/S within a shield on 14K gold ring

by Sara
(Philadelphia, PA)

I have a ring and would like to know if anyone has information on the maker's mark. I attached some pictures. The stones, we believe, are two diamonds with a blue topaz in the center. It is 14K gold. There is another marking/etching inside the ring, it may be a serial or lot number? I believe it reads "R3294". It's very hard to see.

Any information would be greatly appreciated!