I'm going to propose - any advice?

Hi there, i am planning on proposing to my girlfriend when we go to Icmeler in September.
I have a few ideas on how and where I'd like to propose however I am open to suggestions in order to make the evening perfect, does anyone have any ideas?
Also, how much am I looking at to buy her a full 1 carat diamond ring?
thanks.
GD
I have a few ideas on how and where I'd like to propose however I am open to suggestions in order to make the evening perfect, does anyone have any ideas?
Also, how much am I looking at to buy her a full 1 carat diamond ring?
thanks.
GD