Ear stud in 10 karat gold set with London Blue Topaz. The ear stud is sold individually. The ear stud belongs to the Rainbow collection, creating combinations of gemstones in all the colours of the rainbow. This ear stud is made in 10-karat gold, and is stamped with 417, which means that it contains at least 41,7% pure gold. Their 10-karat gold is certified Conflict-Free which ensures that the gold is not extracted in conflict areas.