PartiesGwen Stefani, Roger Federer, and More Celebrate Established Jewelry by Nikki ErwinMarch 6, 2015Save StorySave this storySave StorySave this storyPhoto: Courtesy of Established Jewelry1/8Nikki Erwin and Roger FedererPhoto: Courtesy of Established Jewelry2/8Gwen StefaniPhoto: Courtesy of Established Jewelry3/8Hilary Duff and Rachel ZoePhoto: Courtesy of Established Jewelry4/8Demi MoorePhoto: Courtesy of Established Jewelry5/8Jennifer Meyer Maguire