If a hoop has P4SR prepared on it, it means that it's been produced from a mix of white gold and platinum. SETA is a corporation that provides trend jewellery. Their jewelry normally contains a CZ plating above silver. M on a hoop denotes Milor, that is an Italian silver https://marcohklno.blogsumer.com/36010104/jp88-things-to-know-before-you-buy