CN implies that the jewelry is manufactured in China, whereas the letter D means solitaire diamond, indicating that just one diamond is used in the ring. S925 ALE 54 refers to a global regular for sterling silver jewellery, where by ALE is brief for Algot Enevoldsen, The daddy of PANDORA, https://andrescnyit.blogitright.com/37039942/the-fact-about-jp88-that-no-one-is-suggesting