and actually Lady Curzon's tiara is slightly different to the original Boucheron tiara and that of the Nepalese princess.

See picture below where I have drawn on the key difference.



It would be weird that Boucheron made the tiara, sold it to Lady Curzon, she made a slight tweak, her heirs sold it and it ended up in Nepal and then they tweaked it back to its original Boucheron state.

Oh yet another mystery.