Multi-color tourmaline marquise-cut stud earrings. These petite faceted stones showcase tourmaline's remarkable natural color spectrum — from greens and pinks to warm golds — in a refined marquise shape. Set in a classic stud mount for effortless everyday wear. Details Stone: Natural Multi-Color Tourmaline (faceted, marquise cut) Style: Stud earrings Color: Varies — natural multi-color tourmaline (each pair unique) Cut: Marquise About Tourmaline Tourmaline is a boron silicate mineral group that occurs in virtually every color of the spectrum. The marquise cut — an elongated oval with pointed ends — maximizes the stone's color depth and brilliance. Tourmaline is the birthstone for October and one of the most diverse gemstone families in the mineral world. Free shipping on orders over $150. Every order ships with a certificate of authenticity.