I doubt marriage is on his mind at the moment. Far too much uncertainty for him at the moment--he just got some TEFL employment, so it's starting to look okay. But his cashflow is basically decimated.Free bump.
If your bro is serious about the new girl he can have the existing ring remade. Use the existing ring's materials for credit towards a new ring design.
But I get that the need for cash currently can outweigh the suggestion.
GLWS