Nice that you have most of the set !! The hot pin test is easy You just need a pair of pliers and a sewing needle or pin !! Hold the back of the pin or needle with the pliers and heat the pointed end till it gets red hot or at least close to red hot !! Then touch the hot end to the bottom of the item and put a little pressure on it to see if it has a chemical smell and melts a bit !! Stone will have no smell and of course will not melt !! The needle is not large so it does not damage the item or reduce any potential value if any !!