Diamond Tester Portable Electronic Gemstone Testing Pen for Jewelry Jade Ruby Stone Hardness IdSPECIFICATIONS Brand Name: STONE GO 1. Easy to use even for a new beginner 2. Emit audible sounds to give accurate reading 3. Diamond indicator will be showed if the stone is a REAL diamond (Green light) 4. Metal alert (continuous buzzing sound when user accidentally touches metal rather than stone ) 5. Large Small switch for testing diamonds + 8 points 6. To emit sounds to give accurate reading 7. LCD display & LED indicator 8. If a stone is Fake