H is the color and VVS1 is the clarity of the diamond. They are good specs but what makes a diamond really sparkle is the cut. What is the carat weight of the diamond if you don't mind me asking. I think if it's 0.19 ctw or above, they will send you a diamond certificate that shows the cut specifications and plots where the inclusions are. You can input those cut specifications into the Holloway Cut Advisor to see where it stands. It's just a tool to estimate cut quality but your eyes (how it looks to you) is the ultimate test. Also, did they clean it for you? You could clean it at home with one of those jewelry dips or even Windex. (I do this with mine.) If a diamond is dirty, it will affect the sparkle. If you're still unsure, maybe take it back to Tiffany's to compare to other DBTY's to see if they sparkle more.
Shopgirl1996, thank you for suggestion! They didn't clean the diamond and I will definitely try to clean it and see if it sparkles more. Mine is .23ctw, the SA told he will mail me the certificate in a couple of weeks.
I asked the SA to compare with other DBTY's, but they didn't have any in a comparable size, the next one they had was .35 I think and .14 ctw. It seemed to me that .14 sparkled more, but it's really hard to compare when the size is so different...
I read too that the cut is really important and I thought that Tiffany cuts are considered the best. Is it consistently true? has anyone had issues with tiffany's cut quality?
Is it comfortable on you? Some people like wearing it tighter than others. I don't think I would go shorter than having the diamond sit in the hollow of my throat.
I think I need a longer chain, somehow the chain keeps moving back as if the weight if the clasp was pulling it down, as I am moving chain kind of shifts to the back side of my neck and at the front it's really short, while hanging more on the back. Sorry for the poor wording, i don't know how to describe it... Maybe if I elongate it an inch more than I'd want it would be enough.