No clue.
One thing to be aware of is that cz is much heavier ( like 2x more) than diamonds so the weight of the cz is heaver than a diamond with the same dimensions.
Grab a mm gauge or a ruler or a tape measure and measure it across so you can see how many mm it is! Then we can say what a diamond with the dimensions would be appx.
I would think about 3-4 carats (in diamond weight) or so...not sure what size that finger is.
I believe the OP is trying to get that "look" and is not looking at CZs but real diamonds.
If you tell us what size finger you have we can do some mock-ups to show you what carat weight you should aim for
to get that luck.
Edit...here is a mock up of a 2.5 and 3 (using default sizes) on a size 5 finger.
default sizes are
2.5 - 8.91×8.91×5.35mm
3 - 9.46×9.46×5.68mm
We can use specific size of stones if you have one you are looking at.
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