GIA certification is a MUST have, but regarding the Four C's and what REALLY matters...

 

Let's be honest, if you can't see the difference with the naked eye... there's no need to overspend on your diamond. The Chart above illustrates what "most" people would be completely happy with. You can probably go plus/minus a grade as needed.  

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Now that you have an idea of what you want to buy...

Please read the "Where to buy" section so that you don't overpay.