CN signifies that the jewellery is made in China, While the letter D stands for solitaire diamond, indicating that only one diamond is used in the ring. For that reason, if a hoop has N 925 Cn stamped on it, It's really a organic sterling silver ring made in China. https://beckettuitdm.verybigblog.com/35889264/jp88-can-be-fun-for-anyone