PD on a hoop typically represents palladium. Your ring could be palladium-plated if it's PD penned over it. HK is actually a trademark that stands for Harriet Kelsall. They structure and provide jewellery all over the UK and to other areas likewise.  By just investigating or handling jewelry, it is https://slotonline40625.alltdesign.com/how-jp88-can-save-you-time-stress-and-money-55913689