Green Prehnite Stud Earrings from Mary MacGill. These earrings are made by hand in Mary Macgill's studio in the Hudson Valley and feature one-of-a-kind organically shaped Green Prehnite pebbles wrapped in gold-filled wire. These are post-back earrings and sold as a pair. Need a second opinion? If you have special requests or just need advice, please reach out to hello@shop-vestige.com. Green Prehnite, Gold-Filled Wire. Made in the Hudson Valley, NY