PD on a hoop usually signifies palladium. Your ring may be palladium-plated if it's PD penned above it. HK is usually a trademark that stands for Harriet Kelsall. They style and design and supply jewelry everywhere in the UK and also to other sites too.  Can “JP” also stand for https://juliuszagic.vblogetin.com/42900186/not-known-details-about-jp88