Natural touchstone to verify the authenticity of the precious metal, such as gold, silver or platinum, in addition to its caratage, minimizing the damage produced to the piece.
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The touchstone is combined as a support for the gold, silver or platinum test together with the approximate acid vial of the metal that we want to verify, pouring a small amount into it and rubbing the piece to see if it leaves the stain that verifies its authenticity .
Essential element in "buy gold" stores and jewelry stores.
Dimensions: 150x50x12mm.