Crown jewels

Crown jewels were ceremonial jewellery reserved for reigning monarchs. The British Crown Jewels were part of the ceremonial regalia of English monarchy, and were kept in the Tower of London. (COMIC: Secret of the Tower)

According to the Sixth Doctor, Gallifrey did not have any crown jewels, correcting Melanie Bush when she suggested that the Time Lords keep Sabalom Glitz away from the crown jewels. (TV: The Ultimate Foe)