by mdi » Sep 5, 2019 OK PSers, I know you love a good mystery piece -- want to help figure out this hallmark? So this is a strange little ring I picked up during the Ruby Lane tag sale. The seller didn't have much info about it, but it is fully hallmarked. Unfortunately I have done a fair bit of digging and can't figure out where the third mark is from. As far as I can tell, it's not one of the common British assay offices, even though the 9 kt marking suggest a possible UK origin. Also, the seller did note that she thought it was a bit strange to put rubies and diamonds into a 9 kt setting. And who could this mysterious GC maker be? Thoughts?