Green Amethyst (Prasiolite) Sterling Silver PendantGreen quartzfaceted oval, set in sterling silver, and rarer than it looks. Prasiolite is the pale green variety of quartz. Natural prasiolite forms when amethyst or colorless quartz deposits in Brazil are exposed to specific heat and chemical conditions in the earth; most commercial prasiolite originates from the Montezuma mining region of Minas Gerais, where amethyst is gradually converted to prasiolite through geological processes or, in most trade