Which looks the best or preferred size Diamond?

I bought some Diamonds as investments. .90 to 2.05 CTs These have been certified.

I need some colored ones.

1.60 Diamond
1.40 CT Diamond
1.70 CT diamond
.90 CT Diamond
2.05 CT Diamond
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I bought 8 Diamonds , two were.90 CT"s and two 1.40 CT's
Which looks the best or preferred size Diamond?
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