Green Onyx Earrings Natural Gemstone Emerald Green Onyx Earrings 14K gold fill ear wires: May Birthstone gift for her - Pretty dangle earring design with premium natural green Onyx gemstone in this wonderful emerald green shade! Approximately 30 mm (about 1-1/4 inch) in total length with 8 mm diameter gemstone. Hand forged 14k yellow gold fill ear wire & accents.