TK316 is short for TUSK Chrome steel, which indicated that your jewellery will continue to be stainless and you'll have no difficulties cleansing it. The meaning of “JP 88” will vary depending upon the jeweler, state of origin, and unique marking procedure applied. TK316 is brief for TUSK Stainless Steel, https://andersonmqsoq.bloguerosa.com/35813705/jp88-no-further-a-mystery