PD on a ring normally represents palladium. Your ring can be palladium-plated if it has PD published more than it. HK can be a trademark that stands for Harriet Kelsall. They style and supply jewellery all around the United kingdom and to other sites likewise.  Can “JP” also stand for https://slorgacorhariini59124.blogspothub.com/36044368/detailed-notes-on-jp88