Channel setting is the most secure way of setting diamonds into a wedding ring because the entire edge of the band is covering the sides of the diamond. It also makes the diamonds a bit more subtly since they are set low into the ring which makes it perfect for adding a bit of sparkle to the ring.
You can increase the width of the design so that the diamonds will be larger to fill the band or you can choose a design where the metal widens but the row of diamonds stays the same width.
Pave or grain setting is where small beads of metal are used to hold the diamonds in the band, this can be vintage in appearance especially if the design has a beaded edge.
This setting style also allows you to set multiple rows of diamonds to create an encrusted look so little metal can be seen.
Prong set ring have diamonds set onto of the band with each diamond being held by claws this allows the sides of the diamonds to be visible which makes them very sparkly.
As you increase the width of a prong set band the diamond size will increase.