Condition: New Cubic Size: 4mm Claw, Frame, Post: 18K Yellow Gold Marking: K18 Catch: Silicone and 18K W-catch These are four-prong stud earrings, and the cubic zirconia sparkles beautifully, making them very popular. Also, because they are 18K yellow gold, they won't peel or discolor like gold plating, and they won't cause allergic reactions. (※ Some people with allergies to 18K gold are excluded.)