Anguish Gemstone

There are four types of Anguish Gemstones:
 * Titan Gemstone
 * Torment Gemstone
 * Margonite Gemstone
 * Stygian Gemstone

Four Anguish Gemstones (one of each type) can be traded to the Keeper of Secrets in Gate of Anguish for a Coffer of Whispers. One gemstone of each type is also required to complete the Finding a Purpose quest and recruit Razah. Currently, the only confirmed source of Anguish Gemstones is the Mallyx the Unyielding quest.