I have my great-grandmother''s engagement ring and I am trying to figure out what year, or at least decade, it was set. She has Alzheimer''s so she can''t tell me herself, so I was hoping some of you might be able to help me figure it out. It is a very small round diamond, I would guess between .15 and .30 ct, but its not a bad cut. It has pretty good sparkle and fire to it. The setting is yellow gold, about 5-6 mm thick with edges like the picture below and sort of diagonal brushed look, kind of like the second picture. The diamond is held with a 6 prong setting. Was this particular style popular in a certain time period or could it have been made at any time? Any help is appreciated.
