This EASY to use genuine JSP Gold Jewelry test kit will determine the karat value and purity of Gold Jewelry, scrap, bars, coins, and much more! Simply scratch the test stone with your jewelry, apply a drop of the solution to the scratch mark on the stone, and watch the results appear! This testing kit is FUN, FAST, and ACCURATE! This 4 piece kit includes - JSP 10K Gold Testing Solution 0.5 oz. (14 g) - JSP 14K Gold Testing Solution 0.5 oz. (14 g) - (1) 2''x2'' GTE Test Stone with rubber backing for non-slip desktop testing (Reusable up to 100 tests!) - Easy to read and follow instruction booklet!