PD on a hoop typically signifies palladium. Your ring can be palladium-plated if it's PD composed over it. HK is usually a trademark that stands for Harriet Kelsall. They style and design and supply jewellery all around the UK also to other areas also.  Region hallmarks: Some countries have their own https://griffinfxmcs.blogs100.com/37583382/jp88-can-be-fun-for-anyone