Ruby and Sapphire Disclosure Comments (Update 2022)
- No indications of heating.
No heat enhancement has been detected in this gem.
- Indications of heating. Code : H
Enhanced by heat with no residues detected.
- Indications of heating (residues insignificant). Code : H1
Enhanced by heat and indication of very small amount of residues are present in fissures and/or cavities.
- Indications of heating (minor residues). Code : H2
Enhanced by heat and indication of small amount of residues are present in fissures and/or cavities.
- Indications of heating (moderate residues). Code : H3
Enhanced by heat and indication of moderate amount of residues are present in fissures and/or cavities.
- Indications of heating (significant residues). Code : H4
Enhanced by heat and indication of significant amount of residues are present in fissures and/or cavities.
- Indications of heating with light elements. Code : H(LE)
Enhanced by heat with light elements (such as beryllium).
- Indications of heating (lead glass filling). Code : H(LG)
Enhanced by heat. Fissures and cavities are filled with lead glass filler.
- Indications of heating (cobalt + lead glass filling). Code : H(CoLG)
Enhanced by heat. Fissures and cavities are filled with cobalt-colored lead glass filler.
- Indications of surface diffusion treatment. Code : H(SD)
Enhanced by heat and the diffusion of chemical elements from an external source (such as titanium).
The color is concentrated in a thin layer at the surface.
Note:
- Low-temperature heat treatment is classified as H.
- High-temperature with pressure heat treatment (PHT/ HTP) is classified as H.
- Residues include borax and glass-like material without lead glass
- H, H1, H2, H3, H4 may be called Pao Kao in the trade.
- H(LG), H(CoLG) may be called Pao Mai in the trade.