Diamond earring settings size question

Hello,

I am getting ready to purchase a pair of Platinum V-Prong Princess
diamond earring settings and not sure about the correct size to
order. They are currently set in 4mm V-Prong gold setting, but the
stones are each less than 3.5mm. I thought that you purchased the
next size up (which would be 3.5mm), but since these are v-prong I
wasn’t sure if that was the reason for the larger current setting of
4mm.

Here are the size of the stones:

3.42 x 3.23
3.23 x 3.38

I appreciate your help!

Thanks,
Lynn