diamondguy75
Rough_Rock
- Joined
- Sep 21, 2006
- Messages
- 16
There shouldn''t be as much of a difference in the face up size as it seems some of you are indicating. The diameter of a 1 ct round is about 6.5 and a princess is only 5.5, but the ratio is not 5.5/6.5 because you have to calculate the areas differently (pi)(r^2) compared to l x w. The round is still slightly larger, but the princess should be about 91-92% as large at 1 ct. (30.25 mm^2 for the princess compared to 33.1 mm^2 for the round) At 4 carats, the difference is even smaller: 9 mm length and width for the princess = 81 mm^2, while 10.4 mm diameter for the round = 84.9 mm^2. So at 4 ct, the princess has about 95-96% as much surface area. Also, don''t princesses tend to be less expensive per carat? I would guess the surface area/dollar would work out almost evenly in the 4 carat range.