Gold Testing Stone

Use this black stone to test the karat value of gold pieces. Rub the test needle and the test article on this touchstone, then apply the appropriate test solutions to determine the karat value. The stone, a surgical black Arkansas stone, is delivered in a stitched faux leather sleeve (4-1/4"L x 2-3/4"W x 1/2"D) that is ideal for protecting the stone when not is use.