Precise Authentication: The GTE 3"x6" test stone allows for accurate precious metal authentication with its finely crafted grooves and non-slip rubber backing.

Premium Materials: Crafted to withstand all metal types such as gold, silver, and platinum, this testing stone provides a genuine substrate for scratches every time and allows for easy to read test results.

Long-Lasting Durability: Built to withstand frequent scratch testing, this reusable stone can be used hundreds of times, making it a cost-effective solution.

Convenient Sizing: Measuring 3"x6", this compact yet functional test stone fits easily on any desktop workspace for on-the-go authentication.

Triple Metal Testing: Made of natural materials, the deep black color allows viewing color changes while testing gold, silver, and platinum surfaces easy! This versatile stone allows testing of the most common precious metals professionally or as a hobbyist.