Joined: Thu Feb 22, 2007 10:23 am Posts: 923 Location: NYC
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!
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
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.
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
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.
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