Corundum Treatments

• Natural Unheated: No evidence of heat treatment found.
• Heat Treatment Indicated: Heating or thermal enhancement applied, with no residue evidence found.
• Heat (a): Heating or thermal enhancement applied, with minor residue evidence (typically borax flux in fissures).
• Heat (b): Heating or thermal enhancement applied, with moderate residue evidence (usually borax flux and minor glass in fissures).
• Heat (c): Heating or thermal enhancement applied, with glass present in fissures.
• Heat (d): Heating or thermal enhancement applied, with evidence of glass filling and dye (commonly cobalt).
• Heat (Beryllium): Advanced heating or thermal enhancement with evidence of beryllium infusion into the corundum core.
• Heat (Diffusion): High-temperature thermal enhancement with foreign material (typically titanium) diffused into the corundum surface.

Emerald Treatments

• Natural No Oil: No evidence of oiling treatment found.
• Insignificant Oil Treatment Indicated: Very minimal or trace evidence of oiling treatment found.
• Minor Oil Treatment Indicated: A small amount of oiling treatment detected.
• Moderate Oil Treatment Indicated: Moderate levels of oiling treatment detected.
• Major Oil Treatment Indicated: Excessive oiling treatment detected.

Jadeite Jade Treatments

• Type A: Natural jade with no evidence of external treatment.
• Type B: Evidence of bleaching treatment (commonly with acid water).
• Type C: Evidence of bleaching and dye treatment.

General Treatments

• Natural Untreated: No evidence of treatment found.
• Dyed Treatment Indicated: Color enhanced using dye, with evidence detected.
• Coating Treatment Indicated: A thin film or coating layer detected on the gemstone surface.
• None (Commonly Irradiated): Irradiation treatment applied; typically very light and considered safe for use.
• None (Commonly Heated): Very light, nearly undetectable heat treatment commonly applied.
• None (Undetected): No detectable treatment found; minor treatments may be common.
• None (Commonly Impregnated): Common and accepted impregnation with polymer, wax, or plastic, typically done to enhance durability.
• Doublet: Two materials or gemstones combined using adhesive.
• Triplet: Three materials or gemstones combined using adhesive.
• Composite: Multiple pieces joined together to create one gemstone, often using glue or glass.
• Impregnation Treatment Indicated: Evidence of polymer, wax, or plastic impregnation to enhance durability and appearance.
• Sugar&Smoke Treatment Indicated: Evidence of enhancement through Sugar or Smoke treatment.