PRODUCT DETAILS This EASY to use genuine GTE Diamond Analyzer will test the purity of Diamonds, Rubies, Stones, Moissanites, CZ (Cubic Zirconia), Sapphire, Rhinestones, lab-created diamonds, zircon, and other simulants! Simply apply the tip of the tester to your stone and wait for the beeping and flashing to appear! This diamond tester is FUN, FAST, and ACCURATE! This 4 piece kit includes: ( Valued at $30!) - GTE Portable Electronic Diamond Tester & Analyzer - Diamond sizing gauge and estimator - Leather pouch for safe storage and carrying! - Easy to follow instruction booklet with color chart! This diamond tester is perfect for traveling with or carrying in a purse or briefcase. A MUST-HAVE for anyone who invests in diamond jewelry! TESTING GEMSTONES & DIAMONDS You might have heard that there are a lot of ways to tell whether a diamond is real or fake. The problem is that most of these methods are not 100% reliable. Using a diamond tester, however, is one of the surest and fastest ways to check if you have an original diamond. A diamond tester is a portable device that you can put in your pocket. The tester has a small, needle-like tip that needs to be placed on the stone tested. If the diamond is real, the device indicates that on its display or with a sound signal. Diamond testers’ principle of operation is based on the fact that different gemstones conduct heat differently. Heat passes through a diamond in a different way than it would through cubic zirconia or glass. A diamond tester will detect the rate at which heat moves through the stone and will tell you whether it is a real diamond. There are also testers that use electrical conductivity to test stones – they are based on a similar principle, but they use electricity instead of heat. This electronic diamond tester is convenient for traveling with or carrying in a purse or briefcase. If you have any further questions, please feel free to contact us. We look forward to serving you in the future.