If it's metals that you want of value. Go to an overseas seller or buyer of an over seas seller. no stone that is a gift will be checked and jewlers can't tell colored imperfections in stones. Jewlers cant tell the stone from quallity rocks unless stamped.Only rare retailers have the equipment to read non licenced stones a fake or a good clear rock. Eye value is most common or judged , value is set high if more work is needed to stone eg: necklace clasp or ring setting in gold. Value is based on gold setting plus stone ,reported value or declared value.