Hex StudsA stud that's just as appropriate for everyday wear as it is for special occasions, our Hex Studs feature your choice of gemstone for a sparkling statement. With 18K yellow gold settings and hexagonal halos of diamonds, these classic earrings are made to last. 18 karat yellow gold Rock crystal 2. 50 carats approx. Diamonds 0. 20 carat approx. Post backs for pierced ears Length 0. 4 inch Width 0. 5 inch approx.