Here''s my little RH sweetie photographed under a strong UV light. (I was wearing goggles) You can see the center stone (a .47 ct round brilliant) shows medium to strong fluorescence. This does not mess up her clarity even under direct sunlight - she sparkles all over the place in a sunbeam!
Here''s my little RH sweetie on the hand. SooCool - I think I see a family resemblance with your 1918 ring. Do you know anything about the history of your ring?