When Camilla came on an official visit with Charles to my place of work last year, I was desperate to get a good look at the ring. On this occasion she was simply dressed in a powder blue wool coat (might have been cashmere actually), that was a bit soot stained from their previous engagement in York.
I only got a quick glimpse of the ring, despite being introduced and giving them both a quick tour of my department, but it wasn't as big a stone as I had expected, and not at all 'flashy'.
The ring is quite a lovely piece - a substantial stone that isn't gaudy....but it certainly isn't the Krupp.......