On May 25, De Beers’ lab-grown diamond brand Lightbox opened its first concept shop, as a store-within-a-store at House of Showfields in Williamsburg, Brooklyn. It is one of 20 shops within Showfields, an “experiential lifestyle store,” and plans to stay in the space until November.

Zimmer Brothers Jewelers has appointed Jocelyn Zimmer president. She is the first female president of the fifth-generation family business, which has a flagship in Poughkeepsie, N.Y., and a boutique in Rhinebeck, N.Y. She joined the 130-year-old retailer in 2001.