AGTA Enhancement CodesDefinition: ENHANCEMENT = Any treatment process other than cutting and polishing that improves
the appearance (color/clarity/phenomena), durability, or availability
of a gemstone.
The following table describes the AGTA enhancment codes we use on our site.
For other codes visit www.agta.org .
If you have any questions about treatments that a specific gem
has undergone please contact us and we will gladly give you more
|The "N" symbol can be used for stones in the event that a stone has
received no enhancement and the seller will provide a guarantee that
there has been none.
|F||Filling||As a by-product of
heat enhancement, the presence of solidified borax or similar colorless
substances which are visible under properly illuminated 10X
|H||Heating||The use of heat to
effect desired alteration of color, clarity, and /or phenomena.
(Residue of foreign substances in open fractures is not visible under
properly illuminated 10X magnification.
filling of surface breaking cavities or fractures usually with glass,
plastic, opticon with hardeners and/or other hardened foreign
substances to improve durability, appearance and/or weight.
intentional filling of surface breaking cavities of a colorless oil,
wax, natural resin, or unhardened man-made material into fissured
transparent/translucent gemstones to improve appearance (i.e., oil,
man-made resin, cedar wood oil, Canada balsam, paraffin, etc.).
|R||Irradiation||The use of irradiation to alter a gemstone's color, may be followed by a heating process.
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