Rock Couture Collection 18ct Yellow Gold Polished Ball Stud Earrings. Simply Elegant... Finish off any look with these 9ct gold ball stud earrings' from our 'Rocks Couture' Collection. Mix and match them with some of our diamond or pearl hoop earrings to style things up for a special occasion or add a similar style necklace & bracelet to complete this look. Diameter: 6mm Finish: Polished Fitting: Post