CN implies that the jewelry is created 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 conventional for sterling silver jewellery, in which ALE is brief for Algot Enevoldsen, The daddy of PANDORA, https://sethjbrgx.madmouseblog.com/17412146/rumored-buzz-on-jp88