What is the best diamond buying guide?

I am looking to buy a diamond ring for my Mother on Mother's Day. I am looking for a diamond buying guide that explains what to look for and stuff. Anyone please?|||Hi, I went through this last year. Buying a diamond could be very complicated, however I looked into it and found a guide that is super cool, plus, if you already know that you want to get a diamond ring for Mother's Day, there are a few guides made just for this task, you will find a description of them at the following link,





http://jewelsit.com/blog/?cat=3





I hope this helps. Happy shopping!! :)