PD on a ring commonly signifies palladium. Your ring may be palladium-plated if it has PD composed about it. HK is a trademark that stands for Harriet Kelsall. They design and style and supply jewellery all around the British isles also to other sites as well.  Can “JP” also stand https://eduardobrkfy.topbloghub.com/43392513/the-2-minute-rule-for-jp88