The GTE 3" x 6" Large 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 large-format testing stone provides extra surface area for repeated testing, making it ideal for jewelers, pawn shops, precious metal buyers, and anyone who performs frequent metal testing.

To test your item, simply scratch the jewelry across the surface of the stone to create a visible metal streak. Apply a drop of testing acid to the streak and observe the reaction to determine the metal content.

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

This large testing stone can be used over 1,000 times, making it a dependable and long-lasting tool for precious metal testing.

This kit includes

• GTE 3" x 6" Large 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 it with the chart included 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 evaluates gold, silver, or platinum.