These are square ammolite earrings. They are sterling silver with a heavy gold plating. They measure 7mm wide and 11mm tall. Each pair of earrings are handmade, and none are exactly alike. Ammolite is a rare, iridescent organic gemstone formed from the 70-million-year-old fossilized shells of ammonites. This gemstone is known for its vibrant, opal-like color flashes and for its uniqueness. The rare fossilized shells can be found in Alaska.