PD on a ring typically signifies palladium. Your ring could be palladium-plated if it has PD published above it. HK is really a trademark that stands for Harriet Kelsall. They layout and provide jewellery everywhere in the UK also to other sites at the same time.  By just checking out https://spencerrqlmx.oblogation.com/36067031/jp88-fundamentals-explained