14kt sapphire enhancer pendant. 2 grams. Marked CID 14Kt. "CID 14kt" refers to a piece of jewelry from Clyde Duneier, Inc., NY, that is made of 14-karat gold. The "CID" mark indicates the manufacturer, Clyde Duneier, and the "14kt" (or 14K) mark specifies the gold's purity, meaning it is composed of 14 parts gold and 10 parts other alloys (58.3% pure gold).