Finding out true angle of diamond

[Blurpandasg2014]

GIA Cert round up/down crown angle and pavillion angle info which make data unreliable when placed into software like DiaCalc.

Is there anyway to get the exact angles of the diamond or isit worth to send the diamond to be appraised by a 3rd party

 

[kb1gra]

I would think a Sarin scan would give this info. I believe that is how the angles are determined in the lab, as well.

 

[headlight]

I have been wondering this same thing re: GIA grading reports. It's not only the angles that are unknown as to their true values, but some of the other measurements are also uncertain when I compare between what my report states versus if I use GIA Facetware... it is very frustrating to not be able to have definitive data. Is there a good/valid argument for rounding?

 

[OoohShiny]

I have been wondering this same thing re: GIA grading reports. It's not only the angles that are unknown as to their true values, but some of the other measurements are also uncertain when I compare between what my report states versus if I use GIA Facetware... it is very frustrating to not be able to have definitive data. Is there a good/valid argument for rounding?

Because it's a sop by GIA to cutters/retailers, which allows them to get stones into GIA XXX that wouldn't otherwise reach that 'gold' standard? lol

What irritates me is that they must scan them and know all the angles in order to do rounding (in the same way they must accurately assess a colour grade for MMDs in order to put them into the wider-ranging 'colourless' and 'near colourless' MMD report bandings) so why not just give us the damned info straight??

Annoying! lol

 

[headlight]

I’m sorry, not familiar with MMD???

 

[AlanDiamond]

how much does GIA round, are we talking about 0.1 or more - 0.2, 0.3, etc.? the diamond I'm looking at specifies exactly 34.0 and 41.0 which makes me wonder...

 

[jp201845]

how much does GIA round, are we talking about 0.1 or more - 0.2, 0.3, etc.? the diamond I'm looking at specifies exactly 34.0 and 41.0 which makes me wonder...

I believe the rounding for crown is 0.5 and the Pavillion is 0.2

 

[Karl_K]

Use the numbers as a guideline and IS/ASET images to narrow it down further.(heart images if h&a is claimed or desired)

 

[Karl_K]

I would think a Sarin scan would give this info. I believe that is how the angles are determined in the lab, as well.

Correct.
There are other brands of scanners but sarin scan is often the generic term that is often used for them all.

 

[EncikG]

https://www.whiteflash.com/about-diamonds/diamond-education/sarin-diamond-reports-1512.htm

I understand that WhiteFlash provides advanced sarin report with their stones.
Just wondering then for WF premium select do pple notice much deviation of the GIA report vs the advanced sarin scan?
Or perhaps even ACA Report vs sarin

 

[kb1gra]

I’m sorry, not familiar with MMD???

Man made diamond, if I recall correctly.

 

[OoohShiny]

I’m sorry, not familiar with MMD???

Man made diamond, if I recall correctly.

Bingo!