In Touch has exclusively learned that Nick Cannon worked with Jacob & Co. to design the $2.5 million ring he gave to bride Mariah Carey. The store's rep confirms that Mariah's new 17-carat bauble was crafted from platinum and features a square emerald-cut, fancy light-pink diamond as the center stone. It's surrounded by 58 intense pink diamonds and two half-moon diamonds on each side.

Mariah reportedly eloped with new boyfriend, Nick, today. The 38-year-old "Touch My Body" singer married Nick, who's 11 years her junior, during a small, "very impulsive" wedding ceremony, according to latina.com. The couple met on the set of Mariah's latest video and tied the knot on an undisclosed island in front of a few close family and friends, including rapper Da Brat. Mariah was previously married to former Sony Music Entertainment executive Tommy Mottola in the '90s, and Nick ended his engagement to Victoria's Secret model Selita Ebanks last year. Reps for the stars did not return calls for comment.