Great price but weird dimensions??: 6.43x6.55x3.99

[Looking4The1]

I''m recently saw a 1 carat, ideal cut, I, VS1 diamond that has a great price. I''m confused though, because the price is much lower than similar diamonds. The only thing that I can find that makes it different from similar diamonds is its dimensions: 6.43x6.55x3.99. There is a big difference between 6.46 and 6.58. Most other diamonds have numbers that are closer together, like 6.44 and 6.46. What do these number mean, and how does this difference in the numbers affect the diamond? Thanks.