PD on a hoop ordinarily signifies palladium. Your ring could possibly be palladium-plated if it's got PD prepared above it. HK can be a trademark that means Harriet Kelsall. They style and design and supply jewelry all over the United kingdom also to other sites at the same time.  Nation https://daltonpuzdg.jts-blog.com/35917432/considerations-to-know-about-jp88