Advanced Search

GIA Spots Broken Diamond Glued Back Together

Aug 14, 2018 8:11 AM   By Rapaport News
Comment Comment Email Email Print Print Facebook Facebook Twitter Twitter Share Share

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
Tags: Gemological Institute of America, GIA, Rapaport News, Troy Ardon
Similar Articles
Rapaport LogoRapaport Weekly Market Comment
Sep 23, 2021
Trading quiet during Jewish and Indian festivals. China slowdown injects caution into the market.
Comments: (0)  Add comment Add Comment
Arrange Comments Last to First
© Copyright 1978-2021 by Rapaport USA Inc. All rights reserved. Index®, RapNet®, Rapaport®, PriceGrid™, Diamonds.Net™, and JNS®; are registered TradeMarks.
While the information presented is from sources we believe reliable, we do not guarantee the accuracy or validity of any information presented by Rapaport or the views expressed by users of our internet service.