Diamond & Gem Tester Pen.
Use this to help to identify gems and gemstones. Confirm or authenticate jewelry before purchasing. Whether you're rock hounding or shopping for jewelry, this handy tool can help you identify your finds. This handy portable gem tester pen has an easy to use LED indicator and is accurate and reliable on identifying diamonds, rubies and other gems.
Gemstone Selector Tool
Accurate & Reliable Jewelry and Loose Gem Test Tool