The photograph shows the setting; the centre stone in it is not the weight you have picked. For that, see the picture below, which is to scale.

1 carat round

6.5 mm across

Shown actual size on a size 6½ hand. Carats are weight; millimetres are what the hand sees.

Halo setting

A ring of small stones around the centre. It reads about half a carat larger than the stone actually is.

We price this by hand. You get the quality options available at that shape and weight and what each one costs, usually the same day. Nothing is charged until you have seen them and said yes.