Which Diamond Measurement Report is More Accurate?

[GreenAsaCountryEarofCorn]

hello all,

so i've narrowed my search to 2 diamonds from 2 different and reputable vendors. both diamonds are virtually the same in almost every aspect except 1 diamond is a branded h&a, g in color with a premium cost $2.5K more. and diamond 2, which i keep going back to, is h in color and is an unbranded h&a. both diamonds have ags lab reports and are triple 0s. both diamonds scored a 1a on the aga.naja cut tool estimator using their respective ags lab report measurements. their respective ideal scope and aset analysis appears to be virtually the same with minimal light leakage.

the issue i am having with diamond #2 is there are 2 additional analysis reports (sarin) provided by the vendor - helium report and a gia facet ware cut estimator; both measurements from both these reports are almost the same. when i use the helium or gia facetware measurements through the aga/naja cut class tool, diamond #2 is now graded as a cut 1b - the table and the crown angle exceeded the 1a limits. diamond #1 has an ags sarin report which of course matches the diamond's ags lab report.

so, i need some help please. regarding diamond #2 - which measurements is more accurate between the ags lab report or the helium and gia facetware analysis? the fact that both the helium and gia facetware measurements are almost the same makes me think that both machines were calibrated before they were used to measure diamond #2. also, does diamond #1 warrant a $2.5K bump in price? what should i offer to pay for both diamonds?

as always, thank you time and help.

here are the numbers for both diamonds:

diamond #1 ags lab report
carat - 1.318
7.08-7.11 x 4.31
branded h&a
cut grade, light performance, polish, and symmetry - 0
color - g
clarity - vs-2 (clouds, crystals and feather)
fluorescence - negligible
table - 57.1%
total depth - 60.7%
crown angle - 34.2
crown height - 14.6%
girdle - thin-med
pavilion angle - 40.8
pavilion depth - 43
star - 56
lower half - 76
cutlet - pointed
hca analysis - 1.1
aga/naja cut analysis - 1a

diamond #2 ags lab report:

7.01-7.01 x 4.28
carat - 1.298
unbranded h&a
cut grade, light performance, polish, and symmetry - 0
color - h
clarity - vs-2 (clouds and needle)
fluorescence - negligible
table - 57.3%
total depth - 60.9%
crown angle - 34.7
crown height - 14.7%
girdle - thin-stk
pavilion angle - 40.6
pavilion depth - 42.8
star - 52
lower half - 79
cutlet - pointed
hca analysis - 0.7
aga/naja cut analysis - 1a

diamond #2 helium analysis:

7.01-7.01 x 4.28
cut grade, light performance, polish, and symmetry - 0
color - h
clarity - vs-2 (clouds and needle)
fluorescence - none
table - 58.4%
total depth - 60.97%
crown angle - 34.85
crown height - 14.5%
girdle - 3.5%
fish eye - 7.14
pavilion angle - 40.74
pavilion depth - 43
star - 50.4%
lower half - 79.3%
cutlet - 0.2%
hca analysis - 1.3
aga/naja cut analysis - 1b

diamond #2 gia facetware analysis:

7.01-7.01 x 4.28
cut grade, light performance, polish, and symmetry - 0
color - h
clarity - vs-2 (clouds and needle)
fluorescence - none
table - 58.4%
total depth - 60.99%
crown angle - 34.85
crown height - 14.5%
girdle - 3.5%
min girdle - 1.75% (medium)
max girdle - 2.22% (stk)
pavilion angle - 40.74
pavilion depth - 42.97%
star - 50.4%
lower half - 79.4%
cutlet - 0.21%
hca analysis - 1.3
aga/naja cut analysis - 1b

 

[Karl_K]

I would talk to vendor 2 about the measurements.
It is not unusual for 2 scanners to disagree a bit.
I would have them rerun the helium scan and look into it.
The pavilion angle is outside of what I would expect the difference to be.
The table size is the least accurate measurement on any scanner but even given that the difference is fairly large.

 

[Karl_K]

Also when I have aset/IS i mostly ignore the HCA and AJA grades, numbers are averages and rounded and not all that accurate.

 

[GreenAsaCountryEarofCorn]

karl,

thank you for your speedy reply. i will speak to the vendor of diamond #2 and ask him to re-run the analysis. but still, wouldn't the lab report be considered the official and most accurate measurements on a diamond as a opposed to a vendor conducting his/her own analysis with their own equipment?

thank you.

 

[denverappraiser]

GIA facetware isn't measuring anything. It's an alalysis tool using the data from the Helium or some other scan. The differences you're seeing between the GIA results and the raw data have to do with the way they handle rounding.

The lab is doing no more or less than a scan just like the jeweler and although I believe AGS is using Sarin, not Helium equipment, I would expect them to be pretty good about staying on top of callibration issues. It's up to you to decide if the dealer is as good or better with theirs but I would be relying on AGS data if it were me.

 

[GreenAsaCountryEarofCorn]

diamond appraiser.

thank you for your reply and advice. can you please advise on which diamond has the better specs? does diamond #1 warrnat a $2.5K increase in price because it's branded h&a, and is g in color? lastly, what is a fair price that i should pay for both diamonds?

thank you again.

 

[kenny]

Get Idealscope pics for any round that scores under 2.0 on the HCA.

https://www.pricescope.com/tools/ideal-scope

Compare it to this chart.
If the vendor refuses to provide an IS pic tell her you're finding another vendor.

 

[diamondseeker2006]

If a diamond has an AGS0 report and a good idealscope image, I don't worry a second about all those other numbers. I think you are over analyzing. But what do you mean by "unbranded" H&A? Is one of them a true brand like Hearts on Fire (I hope not)?

The first stone has a little larger diameter and it is a color grade higher. That explains most of the cost difference, other than maybe a brand premium. But it would depend on what the brand is.

(Okay, I am only seeing a $2000 difference...$11,900 to $13,900 (with pricescope/wire discount)

 

[denverappraiser]

diamond appraiser.

thank you for your reply and advice. can you please advise on which diamond has the better specs? does diamond #1 warrnat a $2.5K increase in price because it's branded h&a, and is g in color? lastly, what is a fair price that i should pay for both diamonds?

thank you again.

I’m not going to give an opinion on stones I haven’t seen but the premium you’re seeing has two components, the G color and the branding. You can divide it however you like but I think you’re being harsh to call all of it branding. That said, the reason people pay extra for brands is because it results in the backing by the brandholder about the quality of the goods. AGS, for example, is a brand. You seem to like it and are willing to pay a 'premium' to get it. No problem. In the case of retailers, this often has some differences in the warranty and such as well but mostly it’s a matter of asking the dealer to devote more time and skills to selecting stones that fit into a narrower set of parameters and to attach their name to it. For example, there have been heated arguments around here about what dealer is using the best definition of ‘hearts and arrows’, an attribute that’s completely outside of what’s graded at the lab. Is it worth it? That depends on you and what services you are expecting from your dealers. For a lot of people, yes it is. For others not so much.

 

[GreenAsaCountryEarofCorn]

respectfully all,

once again thank you for all your replies. first and foremost let me say i don't mean to be harsh or critical in a negative sense. my use of the term branded is not intended to offend or be critical. diamonds are certainly not my world of work or expertise which is why i come on pricescope to read and learn from you all. I too am learning and saw the term branded on a similar post describing 2 rbc h&a diamonds. the person went on to speak about one stone being branded and the other not. thus, i asked in my own separate post what the term branded meant and it was explained to me which is how i used it to explain my situation.

with that said, the aset/is images provided by both vendor s for both diamonds are sharp and well defined with deep shades of red and good contrast; both diamonds match up well with the sample image kenny provided (thanks again) in the excellent to very good range - this helped a lot.

thank you.