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Question regarding clarity on a lab-grown diamond


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Hey everyone,

Thanks in advance for any advice you can offer. I'm planning to propose soon and shopping online for a lab-grown, cushion-cut diamond (my girlfriend's preference is lab diamonds for a few different reasons). 

I am looking at a stone with: 1.51 carat, F color, and SI1 clarity. The retailer lists it as super ideal cut, although I don't see that on the report itself. I've uploaded an image of the IGI report although it's a bit blurry, as well as one of the diamond itself.

My question is - will the inclusion on the face of the diamond be visible and make the diamond look bad in person? Obviously the image is magnified by quite a bit, so it may be a total non-issue, but I am a first-time diamond purchaser and am unsure what to expect. I've looked at other lab diamonds in the same price range, and similar inclusions are present on those as well.

I would also appreciate any other feedback you think is important based on the report and image.




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It is a large(ish) crystal in an SI1 graded diamond, located in the crown right under the table, and it seems to be dark in colour. I would be reasonably certain that under some circumstances it would be visible to the naked eye - even though the angle of the photo seems to indicate that the "circumstances" may well be quite unusual. Unfortunately, the only way to know whether it will bother you is to see the diamond in person.

If you can't do that, what does the retailer offer in terms of a returns policy? Even if it only covers the diamond, it may be worthwhile spending the extra 100 bucks for getting peace of mind (shipping and return) and seeing the loose stone prior to it being set and irrevocably sold.

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Thanks for such a prompt reply!

The website has a 360-video type image, and the crystal does seem to be visible from all angles, at least under that level of magnification. I've uploaded another angle below just for reference.

Fortunately, the retailer does offer returns within 30 days with free shipping both ways, and they say the returns are available on both loose stones and rings.


I'm curious - is there anything else you can see from the diamond or the report that would concern you about this stone?

Edited by chitown87
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13 minutes ago, chitown87 said:

is there anything else you can see from the diamond or the report that would concern you about this stone?

There is something I cannot see that would be my main concern: the quality of the cut. As you pointed out, there is no indication of that from the IGI report, and the vendor's word is worth... well, however much you trust the vendor.

The numbers (including the report number!) from the report are almost unreadable, but it seems to be a very wide and shallow stone (7.22 x 6.00 x 4.03 mm depth?) - not surprising if it is a CVD diamond. This may still result in a very nice cut, but the faceting style they have chosen does not seem to compliment the proportions and the result seems a bit glassy. This said, these are two still images from a video - definitely not a good way of assessing cut by any means.

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Here is a link to the actual listing if that helps. I can remove the link once you've had a chance to view it. I don't seem to see a cut rating on any of the IGI reports for lab diamonds (haven't checked on natural diamonds). Is that unusual for IGI?


Do the depth % or table % relate to the concern that you have regarding it being a shallow and wide stone? I read online to keep those %'s below 70%, and this stone meets those parameters from what I can tell.

edit - I just read through the tutorial which had some nice information on things like the depth and table %. However, I didn't see a chart of what to look for with cushion cut, like there were for some other cuts. Is there another trusted source for what to look for with cushion cut?

Edited by chitown87
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No, it's not that unusual; it's the norm. As far as I know, no major lab has developed a cut-grading system for cushion cuts, in part due to the extreme variability of the "cushion cut" itself: unlike for round brilliants, there is a huge range of faceting patterns and proportions that go under the general name of "cushion".

Depth and table% - in a sense yes, but I didn't specifically look at either, not least because I couldn't read them any better than the rest, and in a rectangular shape they are even less meaningful than in a round or a square. I was looking at the photos ("this stone looks shallow") and then seeking some confirmation in the dimensions ("just over 4 mm deep and over 7 x 6 facing in a 1.50 ct - it is shallow").

Selecting diamonds through table and depth is a bit like choosing a car based on tyre diameter and width. You may avoid some of the really bad extremes (read: tractors and go-karts), but ultimately you are left with no meaningful way of telling a fun-to-drive car from a dreadful barge. Be wary of "absolute rules" and look at the diamond, especially since nowadays photos and videos are relatively common.

Having now looked at the video, I think:

1. It looks less glassy/flat than I thought, but still I don't like it much (funnily enough, I find the table too big, but then I like small tables).

2. The inclusion is almost certainly going to be visible to the naked eye, but I don't think it detracts from the overall looks of the stone. People's tolerance for these things varies a lot, but bear in mind that any inclusion will tend to become more visible over time to you and anyone else who sees the diamond often, as your eye/brain system learns what cues to latch on.

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  • 2 months later...

Hey @chitown87 Yes, I do agree with @Davideleve. It is a large crystal in an SI1 graded diamond. Lab-Grown Diamonds sellers always provide Diamond Certification to buyers.

As I am seeing your shared image above, i can not say much more on it. Do you have more images or any other details for the same? So i can give you more information on it.

Or you can visit this website - https://www.newworlddiamonds.com/pages/lab-grown-diamonds this website has much information about Lab Grown Diamonds and having a good customer support team. You can contact them and ask your queries and get experts opinion before buying any diamonds.

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