Tacori 2620RDSMP - Center Diamond Round or Cushion 1ct?

[Bluesrx9]

I recently purchased the Tacori RDSMP from a friend and am looking for a center stone. I think I have seen both Round center stones as well as cushion. I have a budget of $4500 for a center diamond. The setting can handle up to 1.18ct believe so I am looking for something around 1.0CT. Any help would be appreciated.

Thanks in advance,

 

[chrono]

Settings are made to fit a specific mm size, within a small range. Go by that rather than the carat weight, which has more mm size variation. In short, are you looking for a 6.5 mm stone?

 

[Bluesrx9]

The only thing I can find online is .90ct-1.18ct.