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DISCLOSURE POLICY
Report wordings and nomenclature followed on GTL Identification Reports

GTL has formulated a system of disclosure of all types of treatments seen in the trade and points out on its identification reports in simple and clear wordings. These wordings / nomenclature are in accordance with the international guidelines laid down by the CIBJO and Laboratory Manual Harmonization Committee (LMHC). The disclosure policy is revised from time to time with the introduction of a new form of treatment or modification of an existing method.

Treatment Condition Nomenclature Report Wordings (Comments)
No heat
A ruby or sapphire when do not exhibit any signs of heat treatment
Natural ruby / sapphire No indications of thermal enhancement
Heating – No foreign residue
A ruby or sapphire when display the features of heating
Natural ruby / sapphire Indications of thermal enhancement
Heating – No conclusive features
When no distinct features and / or proofs available to conclude the presence or absence of heating
Natural ruby / sapphire Treatment has not been detected and requires further advanced analysis
Heating – Foreign residue
A ruby or sapphire displaying the features of heating and presence of foreign substance / residues like Borax in fractures
Natural ruby / sapphire Thermal enhancement and heating residues (e.g. borax) in fractures
Heating – Foreign residue & glass filling in fractures
Ruby or sapphire displaying features of foreign substance / residues (like Borax) as well as glass filling using lead, bismuth or silica with in fractures
Natural ruby / sapphire Thermal enhancement and heating residues (e.g. borax) and (lead / bismuth / silica) based glass in fractures
Heating - Foreign residue & glass filling in cavities
Ruby or sapphire displaying features of foreign substance / residues (like Borax) as well as glass filling using lead, bismuth or silica with in cavities (moderate and significant quantity)
Natural ruby / sapphire Thermal enhancement and heating residues (e.g. borax) and (lead / bismuth / silica) based glass in cavities
Heating - Diffusion
When a ruby or sapphire is coloured by surface diffusion
Natural ruby / sapphire (Artificially Coloured) Thermal enhancement and colour modification just below the surface in a thin layer by diffusion of chemical(s) from an external source
Heating - Diffusion (beryllium type)
When a ruby or sapphire display the signs of beryllium / bulk diffusion
Natural ruby / sapphire Thermal enhancement and indications of diffusion of chemical (s) (e.g. beryllium) from an external source
Heating - Diffusion of star
When the star effect is produced by diffusion treatment
Natural ruby / sapphire (Artificially Induced Star) The star has been produced by diffusing inclusions just below the surface in a thin layer
Fracture Filling - Colourless glass
Ruby or sapphire which displays the features of glass filling (colourless) using lead, bismuth or silica
Natural ruby / sapphire (Glass-filled*) * for lead / bismuth glass Thermal enhancement and presence of lead / bismuth /silica based glass in fractures / cavities
Fracture Filling - Coloured glass
Ruby or sapphire which displays the features of glass filling (coloured, e.g. blue / yellow) using lead glass
Natural sapphire (Glass-filled) Thermal enhancement and presence of lead based glass in fractures / cavities.
Dyed with blue colour
Fracture Filling - Coloured oil
When coloured oil (joban) is identified as the filler in fractures
Natural ruby / sapphire Colour enhanced with red / blue colour in fractures
Fracture Filling - Colourless oil
When colourless oil /resin is identified as the filler in fractures
Natural ruby / sapphire No indications of thermal enhancement. Oil in fractures identified
Treatment Condition Nomenclature Report Wordings (Comments)
No Filling
When no filler substance is present / identified
Natural Emerald No indications of clarity enhancement
Fracture Filling - Oil
When colourless oil is present in fractures
Natural Emerald Indications of clarity enhancement - Minor / Moderate / Significant amount of oil in fractures
Fracture Filling - Resin
When colourless resin is present in fractures
Natural Emerald Indications of clarity enhancement - Minor / Moderate / Significant amount of resin in fractures / cavities (if applicable)
Fracture Filling – Oil & Resin
When a mixture of oil and resin is present in fractures
Natural Emerald Indications of clarity enhancement - Minor / Moderate / Significant amount of resin in fractures
                                                             
Criteria used for quantification of filler
Graphical illustration of quantification of filler with respect to size and number of filled fractures in emeralds – minor (left), moderate ( centre) and significant (right)
Fracture Filling – Coloured oil
When coloured oil (joban) is present in fractures in moderate to significant quantities
Natural Emerald Colour enhanced with green colour in fractures
Fracture Filling - Dyed
When light coloured beryl is dyed using colouring agents
Natural Beryl (Dyed) None
Coating
When a beryl is coated with coloured or colourless substances
Natural Beryl (Coated) This specimen has been coated with a thin film / layer which can be removed
Treatment Condition Nomenclature Report Wordings (Comments)
Fracture Filling - Glass
When a diamond is fracture filled with a glass
Natural Diamond Clarity enhancement with a glassy material in fractures
Laser Drilling
When laser drill holes are seen but no glass is filled
Natural Diamond Clarity enhancement using laser drilling
Laser Drilling - Filled
When laser drill holes are filled with a glass
Natural Diamond Clarity enhancement using laser drilling and glassy material in drill hole
HPHT (High Pressure High Temperature)
When a diamond display signs of HPHT treatment
Natural Diamond Indications of colour modification using High Pressure High Temperature (HPHT) process
Irradiation
When a diamond display signs of irradiation
Natural Diamond Indications of colour modification using irradiation / heating processes
Heating
When highly included diamond show black graphitized areas along the fractures
Natural Diamond Indications of colour modification using heating processes
Coating
If a diamond under test is identified as coated
Natural Diamond (Coated) This specimen has been coated with a thin film / layer which can be removed
Treatment Condition Nomenclature Report Wordings (Comments)
Coating Stone Name (Coated) This specimen has been coated with a thin film / layer which can be removed
Colourless impregnation
Using polymer / wax (porous stones like coral, turquoise, etc.)
Stone Name Impregnated with colourless polymer / wax
Coloured impregnation
using coloured polymers / dyes / waxes, etc
Stone Name Impregnated with colourless polymer / wax
Dyeing
When a light coloured stone is dyed to change the colour (when concluded)
Stone Name (Dyed) None
Smoke / Sugar treated
Opal
Natural Opal Colour / phenomenal effect enhanced by smoke/ sugar treatment
Irradiation
(Topaz – colour specific - for blues)
Topaz This blue colour is produced by irradiation / heating processes
Heating
Stones other than corundum (e.g. aquamarine, tanzanite, quartz, tourmaline, etc)
Stone Name No Comment  

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