CN signifies that the jewellery is manufactured in China, While the letter D means solitaire diamond, indicating that only one diamond is Utilized in the ring. S925 ALE 54 refers to an international conventional for sterling silver jewelry, in which ALE is short for Algot Enevoldsen, The daddy of PANDORA, https://reidpdozk.blazingblog.com/36800900/the-basic-principles-of-jp88