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No indication of treatments.

No gemological constraints (for instance no altered inclusions) are present which would indicate that a heat enhancement process was applied.

No indication of treatments ; (Oil).

(Oil). No gemological constraints (for instance no altered inclusions) are present which would indicate that a heat enhancement process was applied. In some certain conditions may modify some internal characteristics of fissure filling by oil.

  1. Insignificant.
  2. Minor.

Indication of heating (H).

(H). In some certain heating conditions may not modify some internal characteristics or other features, if spectral data indicate heating has taken place (no residues present).

Enhanced by heat; H(a).

H(a). Residues insignificant (indication of very small residues within fissures only)
Color and/or clarity are enhanced by heat. Extremely small residues of chemical element present in cavities or as isolated. ‘A-type treatment’ such as present in the ruby or sapphire under consideration are, according to the opinion of AGL THAI Laboratory. Enhancements such as ‘type A’ are considered permanent and will always be mentioned on the report.

Enhanced by heat; H(b).

H(b). Enhanced by heat – minor residues are present (within fissures only)
Color and/or clarity are enhanced by heat. Minor residues of chemical elements present in fissures, the extent can be shallow or deep. Enhancements such as ‘type B’ are considered permanent and will always be mentioned on the report.

Enhanced by heat; H(c).

H(c). Enhanced by heat – moderate residues are present (within fissures only)
Color and/or clarity are enhanced by heat. Moderate residues of glass-like materials or one or more chemical elements present in cavities and/or in fissures, the extent can be shallow or deep. Enhancements such as ‘type C’ are considered permanent and will always be mentioned on the report.

Enhanced by heat H(c+).

H(c+). Enhanced by heat – significant residues are present (within fissures only)
Color and/or clarity are enhanced by heat. Significant and deep reaching residues of chemical elements present in cavities and/or in fissures, the extent can be shallow or deep. Enhancements such as ‘type C+’ are considered permanent and will always be mentioned on the report.

Enhanced by heat; H(d).

H(d). Enhanced by heat – moderate to significant and deep reaching residues
present within fissures and cavities filled with lead glass / a composite silica glass etc., (‘Composite Ruby’) Enhancements such as ‘type D’ are considered permanent and will always be mentioned on the report.

Enhanced by heat H (d) + cobalt.

H (d) + cobalt. Enhanced by heat – significant and deep reaching residues
present within fissures and cavities filled with lead glass/ a composite silic a glass etc., and cobalt (‘Composite Sapphire’) Enhancements such as ‘type D+cobalt’ are considered permanent and will always be mentioned on the report.

Enhanced by heat; H(Be).

H(Be). Enhanced by heat and light elements (e.g. beryllium)
Color and/or clarity are enhanced by heat with light elements such as beryllium (Be), any corundum (Natural Ruby or Natural Sapphire) that shows indications of having undergone heating (is commonly use in the trade) in natural beryllium in corundum treatment; beryllium is found mostly in the mineral beryl (Be3Al2Si6O18); Chrysoberyl (BeAl2O4), Phenakite (Be2SiO4),Bromellite (BeO), and others. Treatment is permanent and will always be mentioned on the report.

Enhanced by heat; H(Diffusion).

H(Diffusion). Enhanced by heat with diffusion.
Color and/or clarity are enhanced by heat and diffusion. Any corundum (Natural Ruby or Sapphire) that shows indications of having undergone heating accompanied by the introduction/diffusion of a chemical element(s) (Heating in the presence of titanium oxide or other coloring agents) To improves or creates asterism, or diffuses color onto the surface of the stone, from an external source or “surface diffusion”, (Avoid (re) cutting or (re) polishing) and will always be mentioned on the report.