Pro-Quality Gold Test Stone- 6x3 inch Large Test Stone with Professional Rubber Backing by PuriTEST

Large 6x3 inch Pro-Quality Testing Stone This large glass test stone includes a rubber grip backing. This test stone measures 6" x 3" x 1/4" *YOU CAN TEST SEVERAL PIECES AT ONCE WITH THIS EXTRA LARGE TEST STONE!* (Test Stones are used to test your gold jewelry without actually testing on the piece itself and ruining it. Instead you apply the acid to a mark that you rub on the test stone.) This stone allows to to test quicker by allowing you to test many items all at the same time!