15 Facts About Peridot We Bet You Didn't Know Peridot is a delightful green gemstone that is, in many cases, used in jewelry. Yet, do you have at least some idea that peridot is additionally accessible in crystal form? Peridot crystals are similarly as stunning as their gemstone partners and have various exceptional properties that settle on them, a famous decision for gem devotees. Peridot crystals are an assortment of the mineral olivine. They structure somewhere down in the world's mantle and are brought to the surface by volcanic movement.