The jewel found at Hertfordshire and mentioned recently is this:
the jewel found
A full-page description here can be found.

The Friday Sotheby's auction offered it under lot No.26, however the list did not ultimately indicate whether it was sold.

The list of 170 items too is cute for the interested eye. An engraved golden ring from the turn of XIV.-XV. century went to big hit: it had been estimated for GBP 8-12.000, then it was sold above GBP 70.000.