This genuine JSP & GTE Silver jewelry tester kit will safely and accurately determine the karat of your Silver Jewelry, bars, coins, and more! Simply scratch the test stone with your jewelry, apply a drop of the solution to the test stone, and watch the results appear! The solution will determine if an item is 925 all the way up to 999 kt, sterling, real solid silver, or plated! Included is 2- JSP Silver test solution bottles, 1- GTE Instruction Booklet, and 1- 2''x2'' GTE Jewelry Test Stone with Rubber Backing for non-slip desktop testing!