9ct Gold Single CZ Cartilage Hoop EarringGold CZ Hoop Earring This 9ct yellow gold single hoop earring is designed for cartilage piercings and features a single, clear cubic zirconia stone set into the band. The hoop is crafted from 9ct gold, which is composed of 37. 5% pure gold, offering a warm and durable colour. The small cubic zirconia provides a subtle point of sparkle within the minimalist design.