JEWEL TOOL Gold Testing Stone (TJ-19105-86) – an essential tool for those in the jewelry industry and gold enthusiasts. This Gold Testing Kasauti is meticulously designed for the testing of golds purity. With its compact dimensions of 2 1/2" x 1 1/2" x 1/8" (6.35 x 3.81 x 0.32 cm), this flat stone is both practical for detailed work and easy to store. For optimal results, this stone is meant to be used in tandem with gold testing keys and forumla solutions. Whether youre a professional jeweler, goldsmith, or a hobbyist, the ability to ascertain the quality of gold is paramount. This high-quality testing stone ensures you get accurate results each time.