PD on a ring commonly signifies palladium. Your ring might be palladium-plated if it's PD composed over it. HK is a trademark that stands for Harriet Kelsall. They style and design and provide jewelry all over the United kingdom and to other destinations at the same time.  Country hallmarks: Some nations https://israelucins.blogdosaga.com/36910304/a-review-of-jp88