JP on a hoop is an indicator and this stamp is employed by a well known jewellery company named Jack Pilatowicz. Jack Launched his company in 2007 in Brisbane, Australia, just after 20 years of experience while in the jewelry production business. If a hoop has P4SR published on it, https://raymondonvwn.timeblog.net/72660337/5-simple-statements-about-jp88-explained