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 ring has N 925 Cn stamped on it, It's really a normal sterling silver ring produced in China. https://casper77daftarsitusjudisl34678.mybuzzblog.com/16693922/the-2-minute-rule-for-jp88