{"product_id":"premium-natural-test-stone-for-silver-gold-jewellery-testing-scratch-acid-tester-black-2-x-2","title":"Premium Natural Test Stone for Silver Gold Jewellery Testing, Scratch Acid Tester, Black 2\"\" x 2\"\"","description":"\u003cp\u003e\u003cstrong\u003eThis natural test stone provides a reliable, high-contrast surface for accurately determining the fineness of precious metals using acid testing.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cp\u003eWhen 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.\u003c\/p\u003e\n\n\u003ch3\u003eHow to use it\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eRub the metal to create a visible streak.\u003c\/li\u003e\n  \u003cli\u003eApply a drop of testing acid to the streak.\u003c\/li\u003e\n  \u003cli\u003eObserve the colour change to determine fineness.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho it's for\u003c\/h3\u003e\n\u003cp\u003eEssential 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the box\u003c\/h3\u003e\n\u003cp\u003e1 x Natural Test Stone (2\" x 2\")\u003c\/p\u003e\n\n\u003ch3\u003eOur promise\u003c\/h3\u003e\n\u003cp\u003eUK-stocked at our Birmingham workshop. Same-day dispatch on orders placed before 2pm. Free UK delivery on orders over £30. 14-day returns — try it at the bench.\u003c\/p\u003e","brand":"Jewellery Tools","offers":[{"title":"Default Title","offer_id":54344635547977,"sku":"JJ-JFYD-GV3L","price":9.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/8031\/7769\/files\/toolsmith-rebg-premium-natural-test-stone-for-silver-gold-jewellery-testing-1777633563.jpg?v=1778358226","url":"https:\/\/www.jewellerytools.co.uk\/products\/premium-natural-test-stone-for-silver-gold-jewellery-testing-scratch-acid-tester-black-2-x-2","provider":"Jewellery Tools","version":"1.0","type":"link"}