Acid Testing Touchstone, Natural Dark Stone — Round, for Gold & Silver Scratch Testing

Before a valuation or a purchase, the touchstone still gives the quickest honest answer. Draw the item across this natural dark stone, apply acid to the streak, and the fine-grained matte surface shows the result clearly against a high-contrast ground — a non-destructive read on gold carat and silver fineness. It sits well alongside our guide to reading UK hallmarks.

The stone is a smooth, rounded natural pebble form, comfortable to hold and turn whilst testing, and durable enough for daily use at a workshop bench or trade counter. It takes a clear metal streak without coming to harm, test after test.

• Natural dark stone provides excellent colour contrast for gold and silver streaks.
• Features a fine-grained, matte surface that takes a clear metal streak without damage.
• Smooth, rounded pebble-like shape is comfortable to hold and manipulate during testing.
• Allows for accurate, non-destructive testing of jewellery and other precious metal items.
• A durable, heavy-duty tool suitable for daily use in a workshop or at a trade counter.

Who it's for

An essential bench tool for UK jewellers, assayers, pawnbrokers, and precious metal dealers who need to quickly verify the carat of gold and fineness of silver whilst assessing items.

Free UK delivery · Same-day dispatch before 2pm · 30-day returns