Everyone wants to know what size of diamond they should buy.
So are you looking for just the right size? What is the right size? It is all up to you. Personally for me the weight is just a number. I buy diamonds on how they look on the hand. Diamond sizes are listed below this handy picture from Gem Gossip.
Smallest to largest (bottom to top):
0.50 carat, VS-2 clarity, F color
1.00 carat, VS-2 clarity, G color
2.01 carat, SI-1 clarity, F color
3.01 carat, SI-2 clarity, G color
4.02 carat, SI-2 clarity, G color
5.59 carat, VS-1 clarity, G color