I have a new-old-stock platinum iridium mount. It has never been set. It's an illusion or fishtail setting (don't really know the difference) with holes for two small diamonds on each side. It's a 6ish but plain band so could prob be resized. I was told it would take a 6.5mm center. Not sure if this is the style at all that you're looking for, but thought I'd throw it out there!