Premium Natural Test Stone for Silver Gold Jewellery Testing, Scratch Acid Tester, Black 2" x 2"

This natural test stone provides a reliable, high-contrast surface for accurately determining the fineness of precious metals using acid testing.

What it does

When you need to verify the karat of gold or silver, this stone offers a consistent surface for making clean metal streaks. Its dark, fine-grained texture ensures that the resulting streak is visible against the black background, allowing for precise observation of the colour reaction when testing acids are applied. This solid 2" x 2" block provides a stable testing base that won't shift during the assay process.

How to use it

• Rub the metal to create a visible streak.
• Apply a drop of testing acid to the streak.
• Observe the colour change to determine fineness.

Who it's for

Essential for UK bench jewellers, silversmiths, and pawnbrokers needing to confirm metal content. This stone serves as a direct replacement for worn-out testing surfaces and pairs perfectly with your existing set of gold and silver testing acids for quick, on-bench verification.

What's in the box

1 x Natural Test Stone (2" x 2")

Our promise

UK-stocked at our Birmingham workshop. Same-day dispatch on orders placed before 2pm. Free UK delivery on orders over £30. 30-day returns — try it at the bench.