54mm Ametrine sphere, $58. Ametrine is a quartz based crystal in which amethyst and citrine have formed within the same crystalline structure, allowing them to amplify and augment each other. It is said to be the complete balance of the properties of amethyst and citrine. As a stone of both balance and connection, ametrine is believed to relieve tension, bring serenity and stimulate creativity, as well as balance mental stability and self-confidence.