• High-precision identification to verify the authenticity of gold surfaces from 10 to 24 carats. • Safe and non-destructive traditional touchstone method that does not directly damage the jewelry. • Allows for quickly distinguishing genuine gold from counterfeit metals such as silver and copper. • Portable professional kit designed for fast and reliable testing at home. • The set includes 2 bottles of 10 ml testing solution, 1 touchstone, and 1 pair of gloves. • Simple and fast operation through stone scratching and application of a reactive drop. • Suitable for consumers, merchants, and precious metal recycling professionals.