"While her collection of gems has been compared to the likes of Elizabeth Taylor, diamond-loving diva Jennifer Lopez plays it simple in her new flick, Monster-in-Law, with a Shari Wacks necklace. The pineapple quartz pendant is as big as her other baubles, but . . . will not break the bank. Stars like Keira Knightley are also buying multiple strands of the semiprecious stones to create a layered look."