As one of the most popular types of earring for everyday use, we thought it would be super handy to have a set containing 2 pairs of classic ball stud earrings in 2 different shades of gold. A great idea for a gift, these studs both have a 4mm diameter and have butterfly back fastenings. Both stamped with a 375 metal mark, 1 pair is made from 9ct white gold, while the other pair is made from 9ct rose gold.