The ring: Prince William's late mother Diana's engagement ring, which features a 9-carat sapphire surrounded by diamonds.
The courtship: The two met at the University of St. Andrews, and they became an item in 2003.
The wedding: April 29, 2011, at Westminster Abbey.
Matt Ryan and Sarah Marshall
The groom: Matthew Thomas "Matty Ice" Ryan, 25, starting quarterback for the Atlanta Falcons, with a six-year contract worth $72 million.
The bride: Sarah Marshall, 25, a standout athlete in her native Falmouth, Maine, a starter for three seasons on her college basketball team.
The ring: Not as huge as Middleton's, but still a danger if Marshall wears it on the basketball court. Though Ryan didn't say much about the ring, "she'll probably take it off when she plays ball," he said.
The courtship: The two met at Boston College, where Ryan led the school to three bowl victories. They began dating in 2004, and Marshall moved to Atlanta with Ryan in 2008.
The wedding: Will take place sometime in the offseason. "We haven't sent out the invitations yet," said Ryan, who won't reveal the day or place.