I'd assume Chocbar could easily have cost as much as double Catkin; remember Helena Merrick who is not short of a bob or so was "coveting her madly all last season" suggesting that either Pam Marlow snapped her up the instant she was on the market or that even Helena baulked at the asking price.

Also, considering Antiques Roadshow and the like, I can't see even a horribly unfashionable diamond tiara going for less than £10-15,000 these days, can you?