This can occur if the tester was designed to separate diamond from moissanite based on electro-conductivity. Moissanite stones are electro-conductive, but natural-color diamonds are not. However, color enhanced black diamonds become electro-conductive during the process that enhances their color. As a result, jewelers sometimes mis-identify the color enhanced diamonds.So how do you determine if a black diamond is a real diamond or a moissanite? Actually, the test that labeled the diamond as a moissanite reveals the gem's true identity. Although diamond testers identify colorless moissanite, they don't take accurate readings of any colored moissanite. Because neither natural-color black diamond nor black moissanite test as moissanite on the electronic testers, when a jeweler tests a stone and the tester indicates "moissanite, " the test is a confirmation that the black gem in question is a not a moissanite, but is a Color Enhanced black color natural diamond. Make sure all of your auctions have ended prior to checking out. & THE REST OF THE WORLD! The item "Men's REAL Natural Black Diamond Ring AAA Grade Size 10 & $1600 Retail Value +" is in sale since Tuesday, June 25, 2019. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Rings\Diamond". The seller is "sdrcgifts" and is located in Orlando, Florida. This item can be shipped worldwide.