Ball studs are always a super popular design because of how versatile and easy to wear they are. Fancy owning a pair in different types of gold? The studs in this set are made of 9ct rose gold, white gold and yellow gold, so you'll always have a pair to match any outfit and jewellery combination you choose. Each ball stud has a plain design and a diameter of 4mm. This ball stud set would make an incredibly useful gift, particularly as a starter set.