Trustmark 14k Yellow Gold 6mm Deep Sea Coral Created Opal Ball Stud Post Earrings, Cala Add the beauty of Deep Sea Coral to your wardrobe with our Cala line of created Opal ball stud earrings Features our stylish 6mm bead or ball size which measures about 1/5 of an inch. Made with solid 14 karat Yellow Gold. Professionally hand-set in our own US studio.