ST715 = GLASS TESTING STONE 2''x1-1/2''x3/16'' ST715 = GLASS TESTING STONE 2''x1-1/2''x3/16''
ST715 = GLASS TESTING STONE 2''x1-1/2''x3/16'' ST715 = GLASS TESTING STONE 2''x1-1/2''x3/16''

ST715 = GLASS TESTING STONE 2''x1-1/2''x3/16''

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Article number: ST715
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Black glass testing stone for scratch testing silver, platinum and gold with gold testing solutions. Rub the article to be tested on the stone and apply the testing solution to the mark to determine the karat value. Stone measures 2" x 1-1/2" x 3/16".

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