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orchid

Advice On This Idealscope Image

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Please help me evaluating this round diamond:

1.25 ct G VVS2

https://myapps.gia.edu/ReportCheckPortal/getReportData.do?&reportno=2125363127&weight=1.25#

 

Does the IdealScope image show light leakage around the diamond table?

How do I evaluate the transparency quality of this diamond?

I bought this stone for $10,000 and was told that it is a very good deal. What do you think?

 

Thanks.

post-131962-0-70581500-1357097198_thumb.jpg

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We've got 2 issues here. The image is so bad that there's not much to learn beyond that it's at least a pretty good stone. It's seriously out of level in the picture.

 

The pricing has nothing to do with the IS image. It's a GIA/G/VVS2/xxx/n. That's what set the price. Comps are easy enough to find with the diamond finder utility at the top of the page. It seems to be competitive, a little on the low side even. Of 90 stones in the database 1.25-1.29/GIA/G/VVS2, only 5 are below that. 4 of those have medium or greater flouro and the other has a VG cut grade.

 

you evaluate transparency by looking at it. GIA/ VVS2 is VERY unlikely to have any sort of transparency problem by the way.


Neil Beaty

GG(GIA) ICGA(AGS) NAJA

 

There's never a crowd when you go that extra mile.

Professional Appraisals in Denver

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Thanks Neil for your comment. This is the only IS image that I got from the vendor. I'm also looking at this stone:

[/url][/url"]http://https://myapps.gia.edu/ReportCheckPortal/getReportData.do?&reportno=1146662892&weight=1.12[/url][/url[/url]]

(IS image attached)

I'm concerned about the 35 degree crown angle but the IS image seems to be OK, it does not show significant light leakage. Please advise. Thanks.

post-131962-0-38296900-1357136802.jpg

Edited by orchid

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Why are you concerned with the 35° crown angle? By itself it is not a concern, and in conjunction with a 40.8° pavilion it usually works well.

 

Apart from that, always remember that what GIA reports is the rounded average of the 8 crown (or pavilion) angles - if you want to start nitpicking around whether the angle should be 34.5°or 35.0° you should get a full scan of the stone. The first stone you posted may average at 34.74° (rounded down to 34.5° by GIA) and the second may average at 34.75° (rounded up to 35.0°).

 

Final point on reflector images in general: while they are OK to determine face-on brightness, they have little use otherwise. See how a few degrees of tilt change the image between one stone and the other - I'm ready to bet that in real life they look much closer than the IS images would lead you to think; people look at diamonds at all sorts of angles and distances, not just at 12 inches away, 90° from the table plane.


Davide - Specialised Consumer Information and Assistance,
Diamonds by Lauren (http://www.diamondsbylauren.com)
davide@diamondsbylauren.com

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Rather few dealers outside of Pricescope use Idealscopes. The reason for this is a bit complicated but the heart of the problem is that it doesn't show as much as people wish it did and it opens up a whole raft of other questions that ties up time in the sales process. In addition to brightness from the center line with direct overhead lighting, one of the big things you actually can see is the optical symmetry of the stone, which is just fine in your second image and unknown in the first. That's about it.

 

The 'light leakage' and the like in particular is a tricky question and, as Davide points out, is not necessarily bad. The problem is that there is no consistency in the way these images are taken. Most are NOT using a 'genuine' idealscope but rather a facsimilie that's easier to use for pictures. That's ok if you're comparing 2 stones from the same source but idealscope images out of context have gigantic variables. Calling one 'better' than another is often just a matter of which is the best picture, not which is the best stone.

 

Individual variables, like the average crown angle, are even more problematic. Taken out of context they mean very little unless they're way outside the norm (35 crown angle is easilly within the range).

Edited by denverappraiser

Neil Beaty

GG(GIA) ICGA(AGS) NAJA

 

There's never a crowd when you go that extra mile.

Professional Appraisals in Denver

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Neil and Davide,

Thank you very much for your inputs. I'm learning more about diamond everyday from reading your comments on my posts and others.

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AGS does an asset scope on the stones. What many thought years ago was light leakage was really just light coming in at a different angle, thus also blue and green were introduced into the scope.


Jan

For those that want to know the truth about diamonds, just ask.

 

dbof.com

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Excellent points about the interpretive limitations of the Idealscope.

 

Many beautiful face up diamonds get a consumer pass due to minimal white areas on the scope.


Barry
www.exceldiamonds.com
@Exceldiamonds on Twitter

Excel Diamonds on Facebook

sales@exceldiamonds.com
1-866-829-8600
1-212-921-0635

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