Gemstone Comment / Treatment Library

Untreated : No treatment is detected during analysis

Corundum

Heated / H(a); Indication of heat treatment

H(be) : Indication of heat treatment and Beryllium filling

H(b): Indication of heat treatment with glass filling, no colour dye detected

H(c): Indication of heat treatment with glass filling and colour dyeing

Beryl

CE-Minor : Indication of clarity enhancement, usually by oil with minor residue

CE-Moderate : Indication of clarity enhancement, usually by oil with moderate residue

CE-Significant : Indication of clarity enhancement, usually by oil with significant residue

CO: Indication of surface colour coating

Topaz

IRR : Indication of Irradiation

CO : Indication of surface colour coating

Opal

S : Indication of smoking

Quartz

Heated : Indication of heat treatment

CO: Indication of colour coating

Jadeite

Type A : No treatment

Type B : Indication of bleaching and polymer residue

Type C : Indication of polymer residue and colour dye

Coral – Pearl

Dyed : Indication of colour dyeing