Why some Table Reflection is circular while others are not?

[Diamond2014]

Throughout my engagement rings search. I have made three orders, end up returning the first two, and kept the third one. I was able to play around with three diamonds to see its performance but there is something I couldn't get is:

If you look at the diamond in picture below, looking from above down, the table reflection under the table. Some has this perfect round looking shaped while others looks messy. I do understand the differences between Star Facets and Lower Girdle Facets and how it affects the arrow shafts. Its definitely not my camera angle as I took many pictures at all different angles. Table reflection appears larger as the pavilion angle increases and smaller as pavilion angle decreases, I also get that.


I searched on JA to see several perfect close to Towkowski proportion, and looked at their 360 virtual view of the diamonds, but rarely find a perfect circle looking table reflection no matter at what star or lower girdle combination.

The third diamond I kept, when looking through the Aset, will immediately see the perfect round circular table reflection.

How do you get a perfect circle looking table reflection at the middle where the culet is, looking down the table?

1st Diamond - 50 Star with 80 Lower Girdle
2nd Diamond - 50 Star with 80 Lower Girdle
3rd Diamond - 55 Star with 75 Lower Girdle

 

[Paul-Antwerp]

Re: Culet under the table looks different

How do you get a perfect circle looking table reflection at the middle where the culet is, looking down the table?

By cutting the stone correctly, then photographing it correctly.

Live long,

 

[Diamond2014]

Re: Culet under the table looks different

Paul,

When cutting it, which effect how circular or not circular the table reflection is? The table itself?

 

[yssie]

Re: Culet under the table looks different

Paul,

When cutting it, which effect how circular or not circular the table reflection is? The table itself?

Not Paul obviously, but to elaborate:
Size of table reflection is a function of pav depth and table size.
Shape of table reflection in a photo is a function of optical symmetry and angle of photography. Camera lens is clearly not parallel to the girdle plane in the second pic.