Newly engaged WWE superstar Nikki Bella told E! News about the sentimental value behind her stunning Tiffany & Company engagement ring. It was designed specifically for her by her fiance, John Cena. Nikki explained, "It's four and a half carats and we've been together four and a half years, so each side has four diamonds and one side represents John and one side represents me and represents every year we've been together and what we've been through.