V's hand looks like 77, 99, a weak ace or diamonds (less likely) that is sticky. I would check turn, as we have showdown and we have a chance to hang all the worse flushes, if
hits. Having two diamonds in your hand actually hurts you, as V is less likely to have a
. Also, if he has diamonds, we can check back on the river and still win. Same is true for 77 and 99. Weak aces are a small part of his range. Why turn your hand into a bluff by betting turn AND river?