...all these jewels are sold as "Noble Jewels" - there are some more jewellery with aristocratic, noble or even royal provenance.
BTW, the auction is broadcasted in a live-stream on Sotheby's website. It's very interesting to watch! I happened to follow the morning session for the last 25 items and there was Lot 197, a Sapphire Ring with an estimate price of CHF 30'000 - 49'000. It was sold after a thrilling bidders battle for the unbelievable sum of CHF 900'000!!! (hammer price & buyer's premium CHF 1'090'000) - 18 to 30 times the estimated price...
The next session (afternoon) will start in a few minutes time.