Genuine natural Arkansas test stone is used with solutions and test needles to determine the karat value of articles to be tested. Measures: 2" x 1-1/2" x 1/4".<br /><br />Find this tool at: http://www.jewelrytools.com/eurotool/jewelry-testing-supplies/Gold-Test-Stone-Medium-Arkansas-Stone.html<br /><br />Find more at http://www.jewelrytools.com
