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Coloured Diamonds in the Aurora Butterfly of Peace Collection
The “Type” Classification System of Diamonds and Its Importance in Gemmology

Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.

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Coated Pink Diamond — A Cautionary Tale

The Diamond Trading Company (DTC) Research Centre had the opportunity to examine a diamond that, on submission to a commercial gem laboratory, turned out to be a coated pink diamond.

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Treated-Colour Pink-To-Red Diamonds from Lucent Diamonds Inc.

Using a multi-step process, Lucent Diamonds has developed a new treatment process for certain natural diamonds that creates colours from pink-purple to red to orangey brown.

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Two Treated-Colour Synthetic Red Diamonds Seen in the Trade

Two dark brownish red faceted stones, recently submitted to the GIA Gem Trade Laboratory for standard origin-of-colour reports, were found to be treated synthetic diamonds.

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Contribution to the Identification of Treated Coloured Diamonds: Diamonds with Peculiar Colour-Zoned Pavilions

Some treated yellow and blue-to-green diamonds show a peculiar colour zoning when viewed through the pavilion.

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Treated Green Diamonds
Detection of Treatment in Two Unusual Green Diamonds

A pair of sharp absorption bands in the near-infrared region, referred to as H1b and H1c, have been detected in one (and the H1b band in the other) of two green diamonds known to have been treated.

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Serenity Coated Coloured Diamonds: Detection and Durability

Diamonds treated using the new Serenity Technologies coating technique for inducing various “fancy” colours are reported.

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0.76 ct HPHT-treated Diamond
“Fluorescence Cage”: Visual Identification of HPHT-Treated Type I Diamonds

HPHT-treated type I diamonds of various colours may exhibit unusually intense fluorescence at the facet edges and junctions.

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