Find your diamond
Find your jewelry
shape
carat
color
clarity
  • Pricescope Upgrade/Maintenance Is Complete.

    We still have a few things to iron out. If you see any bugs, issues or have any concerns, let us know here in this discussion.

Regarding lab reports & image of gems

Bonsai

Rough_Rock
Joined
Oct 11, 2019
Messages
9
I know some lab reports like GIA, for example, have a disclaimer by the image on the cert that says the image shown of the gem is an "approximate". I noticed on 1 gem I have there may be a "window" on the side that seems to match the representation presented on the GIA certificate. So it got me wondering are the windows shown on the gem reports reflective of the actual gem?
For example in this report here you see 2 windows at the top correct: Will the gem reflect this? Or is the drawing in that regard just arbitrary?
Thx
 

Attachments

Last edited:

Sponsored By:

Related topics:

voce

Ideal_Rock
Joined
May 13, 2018
Messages
2,209
The image in a lab report is what the gem will look like in a certain lighting environment and lighting angle. For silky stones, I would say that the gemstone will look better in person than the lab report images, as silk can help to diminish the visual effect of both windows and extinction. Otherwise, I would expect the stone to look like the lab report image at least some of the time. I think if there is a window, there is a window. I would not rely on lab report images to capture the precise color you would see in real life, but if you see a window, then that's real.
 

MollyMalone

Ideal_Rock
Premium
Joined
Jun 2, 2013
Messages
2,871
I know some lab reports like GIA, for example, have a disclaimer by the image on the cert that says the image shown of the gem is an "approximate". I noticed on 1 gem I have there may be a "window" on the side that seems to match the representation presented on the GIA certificate. So it got me wondering are the windows shown on the gem reports reflective of the actual gem? For example in this report here you see 2 windows at the top correct. Will the gem reflect this? Or is the drawing in that regard just arbitrary?
Thx
Think those 2 white triangles showing up in the posted, lab report photo are due to lighting glare reflecting off 2 facets -- not windows. See, e.g., facet glare in the pics of the multi-million pink diamond that's the topic of this thread today:
and in many vendors' photographs.

That said, I don't know that I personally would find that sapphire very appealing in real life: the color seems to be concentrated in a "border" around the outer edge, while the rest of the face-up stone looks much more washed out and not "lively," Perhaps because it's a bit of a pancake stone? At just 2.63 mm, its depth is, I think, shallower than is typical of a well cut oval sapphire whose face-up measurements are 7.44 mm x 6.08 mm.

But the lab report photo, as displayed on my screen, is not a high quality pic, so it may not be doing justice to that pad.

P.S. Don't panic about seeing a"tilt window" in colored gems as I did after receiving, many years ago, my first, pricey-for-me tourmaline... until the goldsmith I'd asked to make a ring for it put my mind at ease.. ;)) AJS Gems has a brief, but informative, post about this on their website:
 

Bonsai

Rough_Rock
Joined
Oct 11, 2019
Messages
9
Think those 2 white triangles showing up in the posted, lab report photo are due to lighting glare reflecting off 2 facets -- not windows. See, e.g., facet glare in the pics of the multi-million pink diamond that's the topic of this thread today:
and in many vendors' photographs.

That said, I don't know that I personally would find that sapphire very appealing in real life: the color seems to be concentrated in a "border" around the outer edge, while the rest of the face-up stone looks much more washed out and not "lively," Perhaps because it's a bit of a pancake stone? At just 2.63 mm, its depth is, I think, shallower than is typical of a well cut oval sapphire whose face-up measurements are 7.44 mm x 6.08 mm.

But the lab report photo, as displayed on my screen, is not a high quality pic, so it may not be doing justice to that pad.

P.S. Don't panic about seeing a"tilt window" in colored gems as I did after receiving, many years ago, my first, pricey-for-me tourmaline... until the goldsmith I'd asked to make a ring for it put my mind at ease.. ;)) AJS Gems has a brief, but informative, post about this on their website:
Thank you that’s so helpful!
here’s the stone from that report
Looks ok but I’ll know when it arrives tomorrow
Here’s it in different lighting

I have some other Gia reports that showed this type of thing so I thought I’d ask
 

Attachments

Be a part of the community It's free, join today!

Need Something Special?

Get a quote from multiple trusted and vetted jewelers.

Holloway Cut Advisor



Diamond Eye Candy

Click to view full-size image.
Top