Wedding Band Dimensions

Engagement Ring Help?
OK so here is the deal…..
I need help picking out the carat size. She has a size 5 finger. She is very tiny only about 5 feet tall. I was think about .9 or 1 with a ring that I liked from blue nile. I was going to get the diamond some place else.
Here are my other dimensions:
SI1 or VS2 clarity
G or H color
Ideal Cut
No color
Other concern. The ring that I was looking at does not have a wedding band because of the unique design…..is this an issue????
Also, does anyone know a good place to look for loose diamonds?
Thanks,
Try www.whiteflash.com. They are often a place people go to when they want diamond that has a life time upgrade benefit and a 30 day return policy plus free shipping. Also there is no diamond that is sent to the customer without it being reviewed by a team of diamond specialists including gemologists. Here is a little bit about their diamond and here is more about buying a diamond online. http://www.whiteflash.com/about-diamonds/news/analyzing-diamonds-online.htm
Good Luck!
Dimensions featuring Valarie Adams performs at Links Gala