Opal and Gold Stud Earrings E199 Qty: 1 2 3 4 5 6 7 8 9 10 Price £376.00 OPAL 9CT GOLD STUD EARRINGS. Beautiful solid opals with lots of green, blue and pink fire colour. The 6mm round stones are set in 9ct yellow gold mounts with post & scroll fittings for pierced ears 9ct yellow gold Birthstone - Opal for October earrings studs