Recently on Facebook an old high school classmate asked a question about diamond grading. I posted a response and was surprised at the number of my friends in the jewelry business that wanted me to explain the diamond grading system in more detail. It was then I realized that not everyone has been doing this their whole life. So I promised everyone I’d go through the ABCs of diamond grading for them at the very basic level and explain how we do it. If you’ve been doing this for a while, you’re not going to learn anything today, so stop reading now. But if you’re new to the industry and just don’t understand the VS’s and SI’s and whatnots, this is for you.