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GIA Spots Broken Diamond Glued Back Together
Aug 14, 2018 8:11 AM
By Rapaport News
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![](FilesRep/Gallery/Green glued diamond 520.jpg)
RAPAPORT... The Gemological Institute of America (GIA) has identified a stone
comprising two halves of a diamond that had been stuck together with an “unknown
adhesive.”
Graders noticed a large fracture and cavity on the table of
the marquise-cut, 1.38-carat polished diamond submitted to the GIA’s laboratory in Carlsbad, California, for colored-diamond testing. When the
gemologists examined the crack under a microscope, they noticed a gap running
down the stone from the crown to the pavilion, as well as a slight misalignment
in the facets and air bubbles inside the fracture.
The polish lines on the stone’s facets would have linked if
there hadn’t been a fracture, GIA gemologist Troy Ardon explained this month in a lab note in the latest edition of Gems & Gemology. For that reason, gemologists
determined that the stone had been broken in half after it was at least
partially polished, and then repaired with an unidentified adhesive.
“Diamonds have been adhered together with glue to form a
diamond-doublet, but a broken diamond that has been repaired was not something
previously reported by GIA,” Ardon added.
The GIA couldn’t grade the diamond because the 4Cs wouldn’t
apply to it, the note continued. A carat weight would have been meaningless, as
it would have comprised the weight of both halves plus the adhesive.
Image: Robison McMurtry/GIA
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Tags:
Gemological Institute of America, GIA, Rapaport News, Troy Ardon
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