ROR is the Registered Mark for Richard Oxholm Rasch - Copenhagen 1913-1937. DO NOT let anyone tell you any different. You can look find it here: AND if your ring has the mark 14KP that means 14 Karat Plum which is a mark used back then to Guarantee that the ring was 14 Karat Gold or better. Same if it was 18 or 24.
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ROR Stamp by: Anonymous
I just purchased a modern, custom engagement ring and noted the ROR stamp on the inside as well. My jeweler told me it means Ring-on-Ring, or multi-banded, which makes sense to me based on the design. Cheers!
