Izzy: "The most important thing, when you're looking into diamonds, you gotta make sure you buy a GIA-certified stone. If you want to buy something that’s quality and reputable, I recommend GIA-certified diamonds. It’s a laboratory first of all, and it’s the number one laboratory in the world. There’s only two laboratories, here in NY and one in California. GIA stands for Gemological Institute of America.That’s a laboratory where they only certify colored diamonds, diamonds, and gemstones — and that’s all they specialize in."