How much is a perfect 1 carat diamond?

'Perfect' is a judgement, and you are the judge.

Today, on Blue Nile, you can purchase a 1.14 carat, round brilliant, with Excellent polish, no culet, no fluorescence, with a medium to slightly thick girdle, depth 61.5%, table 57.0%, D colour, flawless diamond and spend US$36,631.

(This is the smallest 'perfect' diamond on sale today at that site.)

If this is not your idea of 'perfect', well, there you go.