I happened across this diadem when I was searching for something else and I’m very glad I did.
The technical term for this is “amazeballs.”
The Sotheby’s listing explains that this 19th century piece displays a combination of two styles. The diadem itself (the band) is decorated with table-cut white sapphires and applied with various colors of enamel tha depict a floral motif of Indian origin, while the center section is an example of Qajar style. The central element is applied with enamel flowers and set with foil-backed cabochon emeralds, cabochon rubies and rose-cut and table-cut diamonds.
The description also says that the back of this central element depicts dancing girls but, tragically, does not provide a picture.
This beauty was listed for sale in a Sotheby’s auction. All images and info are thanks to Sotheby’s.