Premium Gold Test Stone-Made in the USA 3" x 1-5/8" x 1/4" New Tools Designed for decorative surface treatment

Designed for decorative surface treatment applications in professional jewelry and metalsmithing

Helps eliminate air bubbles from casting investment for cleaner

Each set includes one post and one nut

4 mm at the tip and tapers to 0

Salamander Super A crucibles are made of natural flake graphite and silicon carbide bonded with fine clay

Premium Gold Test Stone-Made in the USA 3" x 1-5/8" x 1/4" New Tools Designed for decorative surface treatmentA professional grade gold testing stone made in the USA from natural Arkansas black novaculite, quarried and cut domestically. Used by jewelers and metalsmiths to test precious metals, this stonealso known as a streak stone or touchstoneprovides a reliable surface for acid based karat testing. Beware of cheap imitations made of glass, which stain and degrade quickly under repeated use. To test a metal item, rub or scratch it across the stone's