This EASY to use genuine RARE EARTH N35 NEODYMIUM EARTH MAGNET will determine the purity of Gold Jewelry, scrap, bars, coins, and much more! This magnet can pull up to 200LBS!! (13,500 Gauss) Rare earth magnets detect iron particles from jewelry and coins. Rare earth magnets are created with a mixture of rare earth elements and are the strongest magnets to be found. Rare earth magnets are the perfect tool for detecting impurities in precious metals. Knowing how to spot a piece of gold or silver jewelry at the thrift store could mean the difference between a real steal and a bad deal. Magnets are a quick and convenient way to determine real/fake gold and silver without damaging the piece before you buy! The next time you spot a precious metal, put it to the test. Take your coin or piece of jewelry, and place a strong magnet on top of the object. Slowly tilt your metal item to see if the magnet sticks to the object by the magnetic pull, or if it slides off onto the ground. This kit includes: - N35 Neodymium Magnet 2inch x 3/4inch x 1/8 inch with Nickel Coating WARNING- THESE MAGNETS ARE EXTREMELY STRONG, HANDLE WITH CARE! If you have any further questions, please feel free to contact us. We look forward to serving you in the future. 1 YEAR GUARANTEE ON ALL PRODUCTS!