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Tomdiamond

INTERNAL graining and SURFACE Graining not shown.

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Hi,

looking at both the following diamonds.

1.05 has been confirmed as eye clean with no BGM. On gia report it says in the comments ‘CLOUDS NOT SHOWN’.  

https://www.bluenile.com/uk/diamond-details/LD13560253


the 1.04 has been confirmed as eye clean with no BGM. On gia report it says in the comments ‘INTERNAL GRAINING NOT SHOWN. SURFACE GRAINING NOT SHOWN’. It is a VS2 Clarity. No visuals provided but I have requested but even with this I doubt I will see graining

https://www.bluenile.com/uk/diamond-details/LD13904496

 

both stones similar cut. 1.04 is slightly superior cut imo. My question is, which is the better option? Will the graining affect light performance and transparency? 

thanks 

Thomas 

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Graining (internal or external) may affect transparency since (esp. internal) it is a sign of strain in the crystal lattice. Will it do so to a point that it is visible? Most likely not in a VS1 stone, but seeing it is the only way to tell.

Light performance is so vague a concept as to be impossible to answer. Does an opaque or translucent stone exhibit "light performance"? If the answer is "no, because there is no significant internal reflection/refraction", then graining can affect "light performance", since it can affect transparency...

[What is BGM?]

They are largely equivalent (and hiding some weight in the girdle), if you are not bothered by the smattering of stuff in the SI1, but there is no indication beyond the report proportions of what the VS1 actually looks like. The fact that it is quite cheap for the grading makes me think there is some issue with it.

  • Thanks 1

Davide - Specialised Consumer Information and Assistance,
Diamonds by Lauren (http://www.diamondsbylauren.com)
davide@diamondsbylauren.com

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4 hours ago, davidelevi said:

Graining (internal or external) may affect transparency since (esp. internal) it is a sign of strain in the crystal lattice. Will it do so to a point that it is visible? Most likely not in a VS1 stone, but seeing it is the only way to tell.

Light performance is so vague a concept as to be impossible to answer. Does an opaque or translucent stone exhibit "light performance"? If the answer is "no, because there is no significant internal reflection/refraction", then graining can affect "light performance", since it can affect transparency...

[What is BGM?]

They are largely equivalent (and hiding some weight in the girdle), if you are not bothered by the smattering of stuff in the SI1, but there is no indication beyond the report proportions of what the VS1 actually looks like. The fact that it is quite cheap for the grading makes me think there is some issue with it.

Thanks so much for your advice. I will be back if I can obtain a visual of the 1.04!

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Looking forward to it. BN isn't the most cooperative vendor in this respect, but things may have changed.

I'll ask my question again, if you have a second: what is BGM?

  • Thanks 1

Davide - Specialised Consumer Information and Assistance,
Diamonds by Lauren (http://www.diamondsbylauren.com)
davide@diamondsbylauren.com

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Thanks. Blue nile confirm it is is eye clean and no bgm (brown or green tint or milky)

for the 1.05 diamond they confirm it is eye clean and no green no brown and no milky. But I find this hard to believe as it looks warm/ brown to me in the pic.

while every other J I ever check with them comes back that it HAS A SLIGHT BROWN TINT.  I want my diamond to look as white as possible. I’m concerned that the brown tint has been missed on the 1.05 J if can see it warmer in picture.

also don’t know what is best. If the 1.05 is genuinely no brown tint then I would hope that this would appear more white than one with brown tint. But maybe the yellow tint in this particular 1.05 diamond would be worse than one that they tell me has brown tint.

 

what a minefield!!

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4 minutes ago, davidelevi said:

Looking forward to it. BN isn't the most cooperative vendor in this respect, but things may have changed.

I'll ask my question again, if you have a second: what is BGM?

Thanks. Blue nile confirm it is is eye clean and no bgm (brown or green tint or milky)

for the 1.05 diamond they confirm it is eye clean and no green no brown and no milky. But I find this hard to believe as it looks warm/ brown to me in the pic.

while every other J I ever check with them comes back that it HAS A SLIGHT BROWN TINT.  I want my diamond to look as white as possible. I’m concerned that the brown tint has been missed on the 1.05 J if can see it warmer in picture.

also don’t know what is best. If the 1.05 is genuinely no brown tint then I would hope that this would appear more white than one with brown tint. But maybe the yellow tint in this particular 1.05 diamond would be worse than one that they tell me has brown tint.

 

what a minefield!!

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Thanks! I suspect it's Brown or Grey, since if it were green it would be considered a fancy colour, and it would be worth quite a bit more than a K-colour.

Bear in mind that a J will look warm in some circumstances regardless of the tone of the tint, and distinguishing a brown from a yellow tint in a J is not something that can be done via photos

(GIA would argue that any tint in a J is so faint that it cannot be graded reliably - from K onward GIA will say "faint brown" or "faint grey"; if nothing else is added, it's assumed "faint yellow").

Also, in my experience, a brown tint is often more difficult to detect than a yellow one in real life, although the effect is subtly different; it can look almost pink if set right.

However, and with the greatest respect, if one of your priorities is to have a diamond "look as white as possible", J is not where I would start. 


Davide - Specialised Consumer Information and Assistance,
Diamonds by Lauren (http://www.diamondsbylauren.com)
davide@diamondsbylauren.com

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No BGM means no Brown Green or Milky.  None of this is very precise and no serious lab uses it. It came into trade lingo a few years ago when the politics of Zimbabwe became an issue.  (Most Green stones come from a particular region of Zim).  Honestly, I don't think I've ever heard a consumer use it. May I ask where you heard it?  

Edited by denverappraiser

Neil Beaty

GG(GIA) ICGA(AGS) NAJA

 

There's never a crowd when you go that extra mile.

Professional Appraisals in Denver

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