Gemstone Enhancement Codes*

N = NOT ENHANCED F = FILLING O = OILING/RESIN
H = HEATING R = IRRADIATION B = BLEACHING
U = DIFFUSION C = COATING L = LASERING
HP = HEAT & PRESSURE D = DYEING I = IMPREGNATING
SC = SPECIAL CARE W = WAXING/OILING REQUIRED IN OPAQUE STONES

*Codes and type of treatments must only be used as directed in the Gemstone Information Manual, available at http://www.agta.org/info

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