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Diamond light performance

Angie Nguyen

Rough_Rock
Joined
Feb 27, 2021
Messages
9

Recently I’ve updated my wedding ring to a 1.83 ct. I thought I picked the best proportion based on the super ideal range. I sent my ring for the light performance test and I was disappointed with the result. I wonder if surface graining or faint fluorescence impacted the brilliance of the stone.

On the gemex report the brilliance and sparkle only made it to the high medium. Is this still consider a diamond with good light return?

Any feedback would be greatly appreciated. 3F8BB58E-9F95-4F5C-9262-A935FA8A8C9A.png

ECB7B7C2-E30B-4CC3-8510-D854E802F4DF.jpeg

 

laken70

Rough_Rock
Joined
Feb 27, 2021
Messages
60

I’m not an expert, but you diamond looks nice on paper. Have you run it through the HCA tool to see how it scores? Also, please post some pics of it. I’d love to see it!

 

laken70

Rough_Rock
Joined
Feb 27, 2021
Messages
60

Your ring is stunning! I don’t know much about the GemEx report. I’m sure some of the experts here will be able to tell you more about that and your diamond. In addition to the HCA tool on this site, you can also plug in your diamond’s specs on diamondscreener.com and see where your diamond falls when it comes to AGS Ideal and GIA excellent.

 

Angie Nguyen

Rough_Rock
Joined
Feb 27, 2021
Messages
9

Thank you for the kind words. I plugged in the numbers on the HCA tool before I purchased and it came back with the score of 1.7. The one I planned to get before that has the HCA score of 1.4 but that diamond table was 60. So I went for this instead of the other one.

 

laken70

Rough_Rock
Joined
Feb 27, 2021
Messages
60

Anything between 1-2 is what you want. 1.4 vs 1.7, from my understanding, doesn’t mean one score is better than another. Also, I honestly think the smaller table in the diamond you chose is better, too.

I’m sure the experts here will want to see the Idealscope of your diamond to be able to better evaluate.

Honestly, I wouldn’t get too caught up in the numbers. Your diamond looks really gorgeous and just seeing the specs, I cannot see anything at all to worry about. Again, I’m not expert...just a lurker that has been learning a lot about diamonds on here!!

 

Rhino

Ideal_Rock
Trade
Joined
Mar 28, 2001
Messages
6,289

Good morning. :)

I've used the GemEx for over a decade and have tested and studied the results of hundreds if not thousands of varying proportion sets on it. There are a few things you should bear in mind about this tech as well as why a diamond would score as it does.

1. The GemEx BrillianceScope results are based solely on direct spot lighting conditions.

2. It does show a diffuse light view for brightness but is not calculated into the results.

3. It is sensitive to leakage. If there is leakage under the table or if the upper halves are cut adversely the score will be lower.

4. Grading in mounted jewelry, while possible, is a result I would not entirely feel comfortable about. If using this exam in a buying decision it is critical the diamond be tested loose. You should have done that prior to purchase.

5. I note your report is a GIA Ex with a 34.5/41 combo with a 62% depth. While these are numbers that do in fact look good on paper it is also important to bear in mind that these are rounded numbers. Ie. Your pavilion angles may in fact be 41 degrees which if so would account for the score. As little as .1 degree on the pavilion, particularly if it's at that critical angle of 41 degrees can make or break the score.

6. On this exam, an accurately taken ASET against the flat white would further explain, confirm or deny the results on the Bscope. When I used it, I would use it in conjunction with other tech that helped one understand the results.

Hope that helps.

Rhino

 

whitewave

Super_Ideal_Rock
Premium
Joined
Feb 29, 2012
Messages
10,949

Anything between 1-2 is what you want. 1.4 vs 1.7, from my understanding, doesn’t mean one score is better than another. Also, I honestly think the smaller table in the diamond you chose is better, too.

I’m sure the experts here will want to see the Idealscope of your diamond to be able to better evaluate.

Honestly, I wouldn’t get too caught up in the numbers. Your diamond looks really gorgeous and just seeing the specs, I cannot see anything at all to worry about. Again, I’m not expert...just a lurker that has been learning a lot about diamonds on here!!

HCA is an exclusion tool, not an inclusion tool. 1-2 still needs images to evaluate performance....

 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
Joined
Aug 15, 2000
Messages
16,130

Further to Rhino's excellent advice from experience.

I was present when a Brilliancescope was taken apart to establish the exact lighting angles from the ring lights that create the effects. They were measured exactly and incorporated into rough diamond planning equipment that can be used by diamond cutters when fulfilling orders for retaiers selling with the Brilliancescope.

The Gemex principle can be easily cheated by diamond cutters. The red rings show the position of the lights and the flares show where light would come from and be directed straight up from the table. See the video with changing pavilion angles.

https://youtu.be/hANtfoRX2ZI

 

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