Question regarding those in the trade and jewellers

[pyramid]

I know that colour accuity is a personal thing and some see colour in a G or H and want a D E or F colour. I was just wondering if those in the trade can tell the difference in the face up position without examining a diamond. I mean if someone came into your store wearing a colourless diamond would you be able to tell it apart from a G colour because of your familiarity and training with working with diamonds?

 

[RockDoc]

Date: 5/5/2007 8:15:57 AM
Author:Pyramid
I know that colour accuity is a personal thing and some see colour in a G or H and want a D E or F colour. I was just wondering if those in the trade can tell the difference in the face up position without examining a diamond. I mean if someone came into your store wearing a colourless diamond would you be able to tell it apart from a G colour because of your familiarity and training with working with diamonds?

Hi Pyramid

In that "proper" color grading is done face down and through the side - rendering a face up judgment isn''t gemologically "proper".

I know this is hard to understand for consumers as the diamond is going to be viewed face up. But face up can appear very different from the gemological standard of how color grade is which is WHY color grading is performed the way it is.

Judging a color appearance face up can vary a lot. The stone can look worse than its color grade face up, the same or better.
Add to the mix that most consumers viewing the face up color look at it in lighting environments not the same as the ones that a gemologist would use in grading.

While from a practical sense, face down grading doesn''t matter much to a consumer as much face up appearance is, grading face up is not really reliabe. Even from an experienced trade member a face up grading consideration is not much more than a guess as reconciled with the actual graded color on a lab report or gemologist.

Rockdoc

 

[pyramid]

Thanks Rockdoc.

No I realised that but I was meaning without examining the diamond as I said could they tell. I suppose though a jeweller or gem expert like you would not really look at customers rings the way we would to see face up if they were a D or G say.

 

[oldminer]

If I am out to dinner and sitting opposite someone wearing a relatively colorless diamond, there is no way I can tell a D from a G/H color. THis might be a color grade from a couple feet away. Is this what you are trying to ask?

 

[diagem]

Date: 5/6/2007 6:24:56 AM
Author: oldminer
If I am out to dinner and sitting opposite someone wearing a relatively colorless diamond, there is no way I can tell a D from a G/H color. THis might be a color grade from a couple feet away. Is this what you are trying to ask?

True!!!

But a real experienced Gem professional would be able to tell the difference between a G-H color and a D-E color in the right light that he (the Gem Merchant) is accustomed to..., even in the face up position...

But the majority of dealers/merchants would not...

 

[diagem]

Date: 5/5/2007 1:37:01 PM
Author: RockDoc

Date: 5/5/2007 8:15:57 AM
Author:Pyramid
I know that colour accuity is a personal thing and some see colour in a G or H and want a D E or F colour. I was just wondering if those in the trade can tell the difference in the face up position without examining a diamond. I mean if someone came into your store wearing a colourless diamond would you be able to tell it apart from a G colour because of your familiarity and training with working with diamonds?

Hi Pyramid

In that ''proper'' color grading is done face down and through the side - rendering a face up judgment isn''t gemologically ''proper''.
True for colorless Diamonds, but if you want to judge/grade colored Diamonds..., face-up is extremely important!!! Much more than face down.

I know this is hard to understand for consumers as the diamond is going to be viewed face up. But face up can appear very different from the gemological standard of how color grade is which is WHY color grading is performed the way it is.

Judging a color appearance face up can vary a lot. The stone can look worse than its color grade face up, the same or better.
Add to the mix that most consumers viewing the face up color look at it in lighting environments not the same as the ones that a gemologist would use in grading.

While from a practical sense, face down grading doesn''t matter much to a consumer as much face up appearance is, grading face up is not really reliabe. Even from an experienced trade member a face up grading consideration is not much more than a guess as reconciled with the actual graded color on a lab report or gemologist.

Rockdoc

 

[pyramid]

Thank you Oldminer and DiaGem.

 

[richipat]

As a non-professional, but a serious "diamond peeker", I can''t really see color differences in that range, but can see clarity differences. Some inclusions can jump right out of the stone even when viewing from a distance of a couple of feet. Also if the stone is really poorly cut, it will appear grey and lifeless making it look darker.

 

[strmrdr]

Date: 5/6/2007 11:06:24 AM
Author: richipat
As a non-professional, but a serious 'diamond peeker', I can't really see color differences in that range, but can see clarity differences. Some inclusions can jump right out of the stone even when viewing from a distance of a couple of feet. Also if the stone is really poorly cut, it will appear grey and lifeless making it look darker.

nail hammer hit!
is that dark diamond across the room a M or a badly cut D?