Amulet of the Living Statue

Stone Resilience. A creature wearing this amulet becomes immune to becoming Petrified.
  Walking Statue. If this amulet is placed on a Petrified creature, the effects of the petrification are suppressed as long as they are wearing the amulet. However, while the petrification is suppressed, the creature becomes vulnerable to Bludgeoning damage. If they are no longer wearing the amulet, the creature becomes Petrified again after 1 minute. A creature can be fully cured of the suppressed petrification by any effect that would normally cure petrification while wearing the amulet.