Posted by Cynthia on July 19, 2012, 2:17 pm, in reply to "Re: more ideas"
He's wearing a royal coronet, as there hasn't been a "prince consort" at a coronation.
Good ol' Wikipedia:
"...[and] the Duke of Edinburgh was granted in 1947 use of, the coronet of a child of the Sovereign (four crosses patée alternating with four fleurs-de-lis)..."