GTE 2''x4'' Medium Black Premium Scratch Touchstone for Acid Gold Silver Platinum Jewelry Testing

The GTE 2" x 4" Premium Testing Scratch Stone is designed for use with testing acids to help determine the purity and karat value of gold, silver, and platinum jewelry, scrap metal, coins, bars, and more.

This durable testing stone allows you to perform fast and reliable precious metal tests by creating a visible metal streak that reacts with testing acids.

The stone features a rubber backing that provides a stable, non-slip surface for safe and accurate desktop testing.

Each stone can be used hundreds of times, making it an essential tool for jewelers, pawn shops, precious metal buyers, collectors, and anyone who regularly tests jewelry.

This kit includes

• GTE 2" x 4" Premium Test Stone with rubber backing for non-slip testing
• Easy-to-follow instruction manual

Simple Testing Steps

1. Scratch the jewelry piece across the surface of the testing stone while pressing firmly to leave a visible metal streak about 1 inch long.
2. Apply a drop of the testing acid that corresponds to the karat value you believe the item to be.
3. Observe the reaction and compare the result with the included chart to determine the metal content.

This testing method is quick, reliable, and widely used by professionals.

A must-have tool for anyone who buys, sells, or invests in gold, silver, or platinum.