What a lovely portrait of a bejeweled Queen Charlotte! That is probably a good look at some of the diamonds returned to Hannover. The relative size of the two queens, and artistic license, need to be considered in comparing the earrings. But I think you are onto a good piece of research. There may well have been different pairs, and of course Queen Adelaide probably owned some jewels privately. Does anyone know whether private jewels of hers were willed to Queen Victoria?