Husband-and-wife retailers Rob Prince and Terry Chambers, owners of Prospect Jewelers since 2000, are active ­members of their local community. So much so, in fact, that Chambers has become the go-to Mrs. Claus at neighborhood events for the Prospect Area PlayReaders theater and the Salvation Army. When the Point Center shopping center asked the duo to help reinvent its family-friendly holiday program two years ago, Prince and Chambers imagined a design competition that would captivate their town’s littlest jewelry aficionados: their customers’ children. Out-of-the-box thinking isn’t ne