PD on a hoop usually represents palladium. Your ring can be palladium-plated if it's got PD written above it. HK is usually a trademark that stands for Harriet Kelsall. They style and supply jewellery everywhere in the British isles and to other spots as well.  Can “JP” also stand for https://elliottzlwfq.blogginaway.com/37779891/jp88-fundamentals-explained