This 18K yellow gold Sophie Bille Brahe diamond stud earring is set with a round cut diamond, totalling 0.12 carats. A single piece, it is secured with a butterfly fastening for a pierced ear. Fact of the day: the modern English word 'diamond' has origins in the Greek word 'adamao,' which shows up in similar words such as adamantine, meaning 'unbreakable.' That makes sense, as that's exactly how we'd describe our bond with this Sophie Bille Brahe earring.