Robert Procop’s Poison Ring holds a disproportionately hefty number of secrets for something so diminutive. Open the bezel to reveal a thumbprint-size vessel concealing a diamond- and emerald-inlaid dagger attached by a chain. Swing open the side doors to expose a yellow diamond on one side, meant to represent good luck, and a golden peacock—a symbol of protection—on the other. “The ring is made for the woman to operate with the click of a fingernail,” says Procop, the designer behind Angelina Jolie’s exquisite engagement ring and her partner on the Style of Jolie jewelry collectio