[ska///235i]

Here's my 2cents

I wouldn't buy a diamond from GGL cert. Only certs I'll go for is GIA or AGS (AGS>GIA>>>GGL).

H color...you will see a tint of yellow at certain lighting (if you have good eyes) and will definately see yellow when compare to a better color grade next to each other. You know how girls/women gather around with their blings, this is when the color grade comes into play...lol

Clarity SI2....now SI2 are very tricky, you will see inclusions by 10X magnify. Most SI are not visiable to the human eye, but there are SI2s that will be noticable. Make sure it is "eye clean". Talk to the sales or look at the cert.

Cut...since this is a GGL cert, I'm guessing their EX cut is just a very good cut compare to the other majors
Can you get me the proportions of the diamond and I'll see how it performs

Price....its ok, you get what you pay for

if you're in a budget, look for 0.85+ carrat with excellent cut / G color / SI1 clarity (eye clean) / and with Fluorescence from Faint-Strong blue but avoid very strong (pls read more on Fluorescence)
There's alot more to the 4Cs....like the cutting/angels/proportion is very important, its how the diamond perform.
don't just go buy a diamond without learning about them...is a huge investment