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D Flawless, Type IIb
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=7&t=14759
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Author:  Alberto [ Tue Nov 01, 2011 1:12 pm ]
Post subject:  Re: D Flawless, Type IIb

A W E S O M E.....

Author:  Osman khattak [ Tue Nov 01, 2011 3:59 pm ]
Post subject:  Re: D Flawless, Type IIb

Fantastic :D :D

Author:  cryst [ Wed Nov 02, 2011 7:20 am ]
Post subject:  Re: D Flawless, Type IIb

llb diamonds are almost or entirely devoid of impurities, and consequently are usually colourless and have the highest thermal conductivity.

Author:  Barbra Voltaire, FGG [ Wed Nov 02, 2011 7:57 pm ]
Post subject:  Re: D Flawless, Type IIb

Type IIb diamonds usually contain boron, and are commonly blue or blue/gray.
Colorless type IIb are quite unusual as I understand it.

Author:  roshanravan [ Thu Nov 10, 2011 3:27 pm ]
Post subject:  Re: D Flawless, Type IIb

The type IIb either natural or synthetic, are bluish, blue or bluish grey in their original state. Natural type IIb diamonds may have received lattice crystal damage, leading to a brown secondary color or colorless/near colorless. the lattice defects can be restored by a HPHT treatment, but no one can predict what color it gets after the treatment, also Flawless clarity is very suitable for HPHT color treatment but in this case the D color itself is pleasant and rare , maybe future owner of this stone someday wish to do HPHT to restore the Blue, i wouldn't do it but some one might!

Author:  Barbra Voltaire, FGG [ Fri Nov 11, 2011 1:26 am ]
Post subject:  Re: D Flawless, Type IIb

roshanravan wrote:
The type IIb either natural or synthetic, are bluish, blue or bluish grey in their original state. Natural type IIb diamonds may have received lattice crystal damage, leading to a brown secondary color or colorless/near colorless. the lattice defects can be restored by a HPHT treatment, but no one can predict what color it gets after the treatment, also Flawless clarity is very suitable for HPHT color treatment but in this case the D color itself is pleasant and rare , maybe future owner of this stone someday wish to do HPHT to restore the Blue, i wouldn't do it but some one might!

I'm not sure I agree with many of the points here.

Author:  roshanravan [ Fri Nov 11, 2011 2:54 am ]
Post subject:  Re: D Flawless, Type IIb

Barbra Voltaire wrote:
I'm not sure I agree with many of the points here.

do you mean technically or if ever some one do hpht on colorless to near color less type IIb diamonds?

Author:  Barbra Voltaire, FGG [ Sat Nov 12, 2011 1:22 am ]
Post subject:  Re: D Flawless, Type IIb

While we are on the topic of unusual D Flawless Diamonds, have you seen the description of the Type IIa, D Flawless, 33+ CARAT, coming up for auction at Sotheby?
Known as: "The Light or Star of Golconda”"
This is worth a click!
Direct link to pdf:
http://files.shareholder.com/downloads/ ... 513796.pdf

Author:  mehoose [ Sat Nov 12, 2011 9:00 am ]
Post subject:  Re: D Flawless, Type IIb

:smt001 stunned not only by the blue but also Barbra's use of 2 cool's and an awesome in a 3 word sentence. 8)

Author:  LaShawn [ Sat Nov 12, 2011 12:59 pm ]
Post subject:  Re: D Flawless, Type IIb

Yep!!

WAY COOL!!!

Thanks for sharing

That is a Rare One for sure.

Wish I could put it in my collection

Author:  Julie Gowans-Poli [ Sat Nov 12, 2011 1:38 pm ]
Post subject:  Re: D Flawless, Type IIb

La Shawn, that's qute the alphabet soup you've got going on there! :wink:

Barbra: lucky you, getting to play with that for a while! That's a truly awesome stone.

Author:  mikko [ Fri Dec 09, 2011 11:23 am ]
Post subject:  Re: D Flawless, Type IIb

WOW! Now this beauty has made itself to G&G :D

Author:  Barbra Voltaire, FGG [ Fri Dec 09, 2011 11:39 am ]
Post subject:  Re: D Flawless, Type IIb

Yes. The photos In the G&G Gem Brief are better than the ones I posted as well.
I was interested to also read about the diamond's thermoluminescence. We couldn't test for that at the shop. :wink:

Author:  360 [ Sun Jan 01, 2012 9:19 pm ]
Post subject:  Re: D Flawless, Type IIb

Whoa, that one took my breath away.

360

Author:  manyfaceted [ Sun Jan 01, 2012 10:50 pm ]
Post subject:  Re: D Flawless, Type IIb

Is there a way to see the G&G Gem Brief without being a G&G subscriber? [wants to see the pretty pictures]

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