PartiesGwen Stefani, Roger Federer, and More Celebrate Established Jewelry by Nikki ErwinMarch 6, 2015Save StorySave this storySave StorySave this storyExpandPhoto: Courtesy of Established Jewelry1/8Nikki Erwin and Roger FedererExpandPhoto: Courtesy of Established Jewelry2/8Gwen StefaniExpandPhoto: Courtesy of Established Jewelry3/8Hilary Duff and Rachel ZoeExpandPhoto: Courtesy of Established Jewelry4/8Demi MooreExpandPhoto: Courtesy of Established Jewelry5/8Jennifer Meyer Maguire