If you're looking for a tool to screen for a lab-grown diamonds, the GIA® iD100™ can identify colorless to near colorless natural diamonds. Let me show you how it works. So, first thing when you get your GIA® iD100™ is you will plug the plug into the outlet. You will take your probe out of the box. It looks like this. It's color coded red matches red, yellow matches yellow. One thing about this probe is you can bend it, but do not kink it because you will crack the light inside. So what you're going to do is you're going to plug each one in, screw it down, and once that's all screwed in, you will turn on the switch, which is in the back. Turn it on and once it comes on it will prompt you to calibrate. Once machine has prompted you to calibrate, you will take your probe, your ring, and you will touch "Calibrate" and hold the probe close to the stone and now it's ready to test. Now, I'll dim the light so you can get an idea of how it works. Once the machine prompts you to test, press "Test". Shine the probe into the diamond and as you can see the light goes right through this stone and it tells you to "Refer", which means it's possible that it's a Type 2a diamond. Two percent of Type 2a diamonds can mean natural, so you send it off for further testing. Now I'm going to move over to a natural stone and when you see this, you'll see how bright it shines. So a natural diamond it will capture all the light inside of it and the machine will tell you that it "Passes". It is a natural diamond. Get your GIA® iD100™ today at Stuller.com/tools.