QUOTE(0204 @ Jul 10 2017, 10:18 AM)
the selling price is 11.6k. It's from wah chan. I can see the actual stone but don't really know how to determine if it's actually excellent. Isn't what GIA said is excellent already that or there is more to see? Here to learn.
Time for me to share some of my humble knowledge.

All the above are diamonds with triple excellent cut, polish and symmetry from
James Allen. For comparison purposes, all 3 are 0.60 D VS2.
Left: Senget arrows at southeast, south and northwest positions. Missing arrows at east and west positions.
Centre: Senget arrows at north, south and northwest positions. Missing arrows at east position.
Right: All 8 arrows are missing.

The above 2 diamonds are taken from James Allen's True Hearts series, which are also given the GIA triple excellent grade for cut, polish and symmetry.
As you can see, the 8 arrows are aligned and there are no missing arrows, which is an indication of highly symmetrical diamonds.
So there you go bro. GIA's excellent cut are defined rather loosely. So you need to really look at the physical diamonds with the aid of scopes to determine its real cut quality and not anyhow trust what you see on paper.

With that being said, the analysis does not stop there. You need to view its hearts from the bottom as well and see if they look fine.
As for light performance, we have the ASET scope, but I will come to that later bro, after you have digested the above information.