We are not jewelers and we are not experts but we have a good inventory of gold marked jewelry with semi precious stones. We use a diamond tester and have a gold kit.. The second one Costco #2 this is the second one we have not a gold locket but a gold teardrop about 1 inches long. this is a longer chain 18 inches long from Costco originally.. 14 kt gold marked RL and Bolivia this is Costco jewelry #2 and weighs 2.5 grams.. We are asking $180 for this 14 kt gold item , beautiful and pictures do not portray accurately these items. Just let me know.. These would be shipped tracked or registered..