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 collection. The artisans Procop works with are often inspired by “historical intrigues,” he says. “A poison ring was used in the Turkish and French royal courts, occasionally holding special gems and often holding more dangerous betrayals.”ANCIENT ROOTSPoison rings, aka locket rings, boast an ancient