TK316 is short for TUSK Chrome steel, which indicated that the jewelry will continue being stainless and you will have no issues cleaning it. The meaning of “JP 88” may vary dependant upon the jeweler, country of origin, and certain marking technique applied. TK316 is brief for TUSK Stainless Steel, https://elliottobnxi.bloggactif.com/38317252/fascination-about-jp88