There is some website out there that will show you what it will look like on different sizes fingers. You just plug in your info. I didn't save the link though so perhaps someone else has it?
Regardless do you have the mm size? Carat weight doesn't really mean anything. For example a typically 1ct is around 6.5mm. However if it is cut steep/ deep it could be much smaller face up size etc. Also pending what shape diamond you bought will cause it to face up smaller or larger then other sizes.
But I wouldn't worry. I think an approx 1ct on a size 6.5 is just fine.