Laboratory Disclosure Comments for Colored Gemstones
Ruby and Sapphire
(New codes are effective as of 01 June 2017)
|Effect of Heat Treatment
||No Residue Found
||Residue Within Fissures
||Residue Within Cavities
|Amount of Residue
|AIGS Disclosure Code
||"Indications of heating"
"Indications of heating" : Basic heat treatment, but with no residue detected
within cavities and/or fissures. Rubies and sapphires that have been subjected
to high-pressure, high-temperature (HPHT) treatment are usually also given
(Lead) / (Bismuth) : Lead and/or bismuth-rich, vitreous residue was encountered
within the tested item’s fissures and/or cavities.
The item’s color has been altered via a surface diffusion process,
whereby coloring ions have been allowed to penetrate the stone to a minute
depth. While this artificial color is stable, it may be removed during any
subsequent re-cutting and/or re-polishing.
(Light Elements) :
The item’s color has been subtley or significantly altered
via a bulk diffusion process, whereby small coloring ions (e.g. beryllium, etc.)
have been allowed to penetrate through the majority of the stone.
However, as the test for beryllium detection (i.e. LIBS) causes minor damage
to the surface of a gemstone, this service is only carried out at the client’s
A-Jade : No indication of enhancement beyond traditional and basic waxing.
B-Jade : Indication of bleaching and subsequent polymer impregnation.
C-Jade : Indication of dyeing.
Clarity enhancement may be classified as “minor”, “moderate” or “significant”,
depending on the amount of filling substances detected within the tested item’s
surface-reaching cavities and/or fissures.
Identification of oil and/or resin is only carried out upon the client’s request, and
charges may apply.
Copyright © 2017 Asian Institute of Gemological Sciences.