With diamonds, you want to know that you're getting what you paid for. You can do that by trusting a jeweler, or you can get a fancy gadget designed to analyze diamonds. And if you're like me, you trust gadgets much more than you trust people.
The DiamondNite Diamond Moissanite Tester let you know if your precious gem is a synthetic diamond or real diamond within just 1.5 seconds. Unless it's a synthetic diamond that's chemically identical to carbon diamonds, in which case there's no real way to tell them apart. Which makes them the same, so you shouldn't really sweat that, right? I'm no jewelery expert.