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02 August, 2023

Algt Colored Stone Identification Report # 06136195

Identification

Species .................................................................................. Natural Topaz
Variety ......................................................................................... Blue Topaz

Description

Shape & Cutting Style ....................... Square Cushion, Mixed Cut
Measurements ......................................... 15.97 X 15.55 X 11.89 Mm
Carat Weight ........................................................................... 24.18 Carat
Color .............................................................................................. Deep Blue
Transparency ......................................................................... Transparent

Additional Grading Characteristics

Trade Color Name ............................................................... London Blue

Comments

Blue Topaz Is Commonly Enhanced By Irradiation And/or Heating To Improve Its Color. 

There Is Currently No Scientific Method Available To Determine Whether This Gemstone Has Been Enhanced Or Not."

High precision cut - ALGT (B)

1 pcs (London) Deep Blue Topaz - 24.18 ct

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Certification

International Gemological Institute (IGI)

Antwerp Laboratory for Gemstone Testing (ALGT)

International Colored Gemstone Association (ICA GemLab)

Instituto Gemólogico Español (IGE)

Gemological Institute of America (GIA)

Gem Report Antwerp (GRA)

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Asian Institute of Gemological Sciences (AIGS)

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No laboratory report

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Colour

Green

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Multicolour

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Bi-colour

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Mixed cut

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Clarity

Eye clean

Slight

Loupe clean

Moderate

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Treatment

No evidence of treatment

No heat treatment

Oiling

Heat treatment

Commonly heated with no evidence of treatment

Not specified in the report

Clarity enhancement

Commonly irradiated with no evidence of treatment

Irradiation

Fracture healing / filling

Impregnation

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Pearl luster

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Optical effect (gemstones)

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1 pcs (London) Deep Blue Topaz - 24.18 ct

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