Thank you all for that information...I went hunting for Caroline's old pictures and came up with this...
However, I do not think they have sapphires...the reflection of her dark hair (in my initial post) and the reflection of her blue dress tricks the eye that there are darker stones in the feathers...but I am quite certain that they are all diamonds and I would definitely create a frame so its wearable as a tiara...now that would be a stunning piece.