Black Stone Square
The Natural Touchstone is an essential professional tool crafted from natural black jasper or slate, designed for accurate, non-destructive precious metal testing.
Black Stone Square
Product Overview
When you need to verify the karat purity of gold, silver, or platinum without damaging the piece, a professional touchstone is your most reliable tool. By creating a visible metallic streak on the smooth, fine-grained surface and applying testing acids, jewelers can instantly determine alloy quality with absolute confidence.
Key Features & Benefits
Non-Destructive Testing: Allows you to test precious metals accurately by taking only a microscopic metal streak, keeping valuable jewelry pristine.
Natural Black Jasper / Slate: Features a dense, fine-grained, and acid-resistant surface specifically calibrated to hold clear metal lines.
Reusable & Easy to Clean: Can be easily wiped and cleaned using water, mild abrasives, or specialized cleaning stones after every test.
Professional Durability: Built to withstand regular workshop use by jewelers, refiners, and pawn shops.
