QUOTE(xerofear @ Jul 3 2018, 10:03 PM)
Ok done reading, learning and taking notes of all 103 pages of this thread.
I'm in the market atm looking to craft together an engagement ring. Planning to pop the question end of the year, so I have a bit off leeway to search around a bit. Budget is RM 5 to 5.5k for ring + setting. Planning to do customize solitaire setting so I'm looking at 3.5k-4k or so for the diamond.
With that in mind, some questions towards sifu @kambingkoh. Browsing through WhiteFlash, I came upon this diamond.
https://www.whiteflash.com/loose-diamonds/r...ond-3213721.htmThat diamond seems to have everything going for it, good depth, crown angle, pavillion angle albeit at the higher end of the limit. The ASET tells a different story though. So I'm curious as to why this particular diamond seems to not have the fire as compared to other ACA diamonds by WhiteFlash although having good proportions
Edit - How do I tag someone?
This is how you tag someone:
https://forum.lowyat.net/topic/2674338/allThis diamond proportions is well-within good proportions. However, the pairing between the total diamond depth and the table width % usually is deep (>=61.7% to 62%) + small (less than 56 or slightly over abit) OR shallow (>=60% to 61.3%) + wide (>=56.7% to 58%)... something like that. Just my observation for some decently cut diamonds that i come up with it. The numbers are made up for reference only, so take it with a pinch of salt.
However, after calculating the what is the ideal weight of this diamond, it seems that it is actually only 0.393ct! Meaning this diamond has cheated up to 0.41ct just to cross the 0.4ct mark i supposed. Nonetheless, this diamond's video looks rather good on my phone screen, however, there is too much penalty in terms of ASET and IdealScope. So I won't really recommend this one. You can see the weak light return at the border of the of the diamond based on the ASET image. Nonetheless, it is still better than a lot of diamonds in the market. Some are straight white in the center of the table, therefore this diamond is categorized as Expert Selection and not A Cut Above. For ACA, there go through strict process by their in-house staff - a few of them, before reaching a conclusion whether a stone is good enough to carry the ACA brand. With this, you will find that the ACAs are some of the best stone you can find.
And back to your question. Yes proportions are there, but how they get the numbers? It is actually based on the average number of 8 different sections of the diamond. Like the crown angle is 34.9, for ACA, one side can be 34.8 while the other side can be 35, so average is 34.9. However, for this Expert Selection, it can be one side 34.5 and the other side is 35.3 so as you see, there are lesser precision in terms of cutting, and hence affect the overall performance, but then, we still get 34.9 on paper. Other parts like paviliom angle is also based on a few sections of the pavilion and then average it.
Expert Selection can be good as some really just missed ACA by a little only. However, those really good ones I found that they are priced close to ACA if not mistaken, in this case, taking ACA perhaps can be all better option.
Hope this helps?
Good luck!