14k Yellow or White Gold Simulated Pink Tourmaline Heart Stud Earrings with Child Safe Screwbacks These earrings are made of solid 14k gold, featuring high quality simulated pink tourmaline. Our simulated pink tourmaline has a rich, beautiful color and an unmatched sparkle, so it will easily convince others it's the real thing. Pink tourmaline is the birthstone for October, making this a great gift for your loved ones with October birthdays!.