5. Three Marble Seals
Given to the Duke of Edinburgh and Queen Elizabeth
Given by: Wee Kim Wee, the president of Singapore; estimated value: not known
Three marble seals, each with a distinctive design, were given to Queen Elizabeth and Prince Philip by Singaporean President Wee Kim Wee in October 1989. The two smaller rectangular seals were personalised and stood upright. Prince Philip had one made for her, and Queen Elizabeth had the other.

A trio of marble seals © Tim Graham via Getty Photos
The larger of the three, with a Chinese guardian lion on top (dragons on top for the lesser two), was intended for the general head of state. East Asian calligraphy is used in seal engraving, and each seal engraving is typically unique to the recipient.
