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 Post subject: Color Grading
PostPosted: Tue Aug 26, 2008 12:07 am 
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I was sorting some melee and applying cost to the different parcels. I kept seeing top-light, and top-top-light brown, as well as cape, colored diamonds. I have heard of all these before, but was trying to find out what these color classes are in respect to the GIA color scale. Any Thoughts?

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PostPosted: Tue Aug 26, 2008 1:49 pm 
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Why is it that nobody seems to be able to answer this question?

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PostPosted: Tue Aug 26, 2008 2:17 pm 
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Hi,

On behalf of everyone on this forum, I would like to offer you our most sincere apologies of having things to do other than answering your questions within a day.
I will have a meeting with the consumer response department and see how we can accommodate you better in the future.

Please accept our sincere apologies.

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PostPosted: Tue Aug 26, 2008 3:10 pm 
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Number 2 hit on a google search for 'cape diamond color'


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PostPosted: Tue Aug 26, 2008 4:08 pm 
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And people wonder why we love you, Doos! :lol:

Nice chart there, gem-n00b! Good to print onto card stock :) .

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PostPosted: Tue Aug 26, 2008 7:45 pm 
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Let me re-phrase that last question...

"Why is it that over the last week, in other jewelry forums, and a few hundred viewers who have seen this exact question have not been able to come up with an answer?"

I wasn't trying to insult anyone, or seem ridiculously impatient. I guess I could have put a little more time into considering everyones feelings before asking the question in such a manner.

...MY BAD DOOS

Anyways, is there maybe too broad of a range when mentioning top light, or top top light, etc.?

Take your time guys, I'm in no hurry.

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PostPosted: Tue Aug 26, 2008 8:30 pm 
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I am not familiar with the two terms "top" brown... the cape color and its relationship to the GIA scale is easily seen in the above link that shows several different diamond grading scales and how they relate to each other.

I just finished GIA diamond essentials course and was not presented with the two "top brown" terms. If they are darker than GIA Z grade, then they would be classified as fancy diamonds.

John

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PostPosted: Tue Aug 26, 2008 8:44 pm 
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I think, RodMan, your question is answered with the link that gem-n00b posted.
Are you still unclear?


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PostPosted: Tue Aug 26, 2008 11:15 pm 
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Gem-n00b, thanks for the link, that clears up the "cape" portion of my question.

If anybody has anything similar relating to "top-light" or "top-top-light" brown diamonds, I would appreciate the info.

Stuller uses the "top" terminology, and I can't seem to get any information out of them.

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PostPosted: Wed Aug 27, 2008 12:27 am 
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The Argyle Mines have devised the C1-C7grading scheme for browns:
Image


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PostPosted: Wed Aug 27, 2008 6:29 am 
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Hi,

The link is partially based on Pagel-Theisen's list and the GIA scale is used most often in the trade. But they are not very good selling depictions, so the old Scandinavian "top wesseltons" etc are still used.
I think Stuller adopted it's own standard for discriminations between the capes. Last week I needed information from Stuller and they replied several times promptly and to my satisfaction.

The Argyle system is a nice one to compare the Stuller images against (if they have them online).

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PostPosted: Sat Nov 01, 2008 1:31 am 
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In case anyone is still interested in the original top top light, etc. question the following was an email I received from stuller:
In response to your question about GIA’s translation to Top Light (TLB), Top Top Light (TTLB) and Cape colored diamonds, the color scale equivalent is as followed:



TTLB = K-L color



TLB = M-N color



Cape = O-Q color

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PostPosted: Sat Nov 01, 2008 11:09 am 
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Oh....I disagree.


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PostPosted: Mon Nov 03, 2008 1:22 am 
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Barbara,

Have you ever ordered any of the above mentioned stones from stuller, or any other company? If so, do you remember what you personally would have graded them as? (Using GIA terminology)

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PostPosted: Mon Nov 03, 2008 10:31 am 
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I can't speculate on the stones you have, but I wouldn't refer to K-N color as light browns...nor O=Q as Capes. Technically, you could have an N color that was yellowish, not brownish and a Q that was brownish not yellowish.

But, thinking this through I guess that could work if you as long as your documentation reflected exactly what your descriptions were based on. The problem I see using terms like Cape and TLB is that they are somewhat archaic and subjective....but, again, I think you could explain yourself in such a way that it would make sense.

Also, you might want to order a couple of samples of this material from Stuller to make sure you are comparing apples to apples and pricing accurately.


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