When Charles, Prince of Wales decided to seek the hand of Lady Diana, diamond was not even in the running. Rumor has it that a call went out for a perfect ruby above six carats to consummate the royal betrothal. So rare is the pigeon blood stone that a suitable candidate could not be found. Instead the Prince made due with an eighteen carat sapphire reportedly from Sri Lanka.

Though the British royal family is not known as tight, the royals are justly admired for their sophistication, knowledge of gemstones and their desire squeeze full value from every, er, pound. Yet historically diamond is not been the gem of choice; aside from Diana, Princess Anne received a sapphire and Andrew gave Fergie a ruby. Do their Royal Highnesses know something we don