Based on the setting (where the large stones sit), they are most likely interchangeable ....
This design allows a screw back mechanism that is attached to the permanent disc... I think you can clearly see what I mean in my closeups
--Previous Message-- : Does that mean that the diamonds on princess : Mabel's wedding tiara are indeed fixed and : not interchangable? : : --Previous Message-- : The monture worn by Princess Mabel at her : wedding day was from Mellerio, it originally : had a mix of white and brown (???) diamonds : but later was all white diamonds. : : :