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Ghene Menezes

ALGT COLORED STONE IDENTIFICATION REPORT
IDENTIFICATION
Species .............................................................................................................. Natural Opal
Variety ............................................................................................................... Crystal Opal
DESCRIPTION
Shape & Cutting Style ..................................................... Modified Pear, Mixed Cut
Measurements .................................................................... 19.85 x 16.26 x 9.12 mm
Carat Weight ................................................................................................... 11.56 Carat
Color ........................................................ White (Yellowish) + Play of Colors (Vivid)
Transparency ................................................................................................... Translucent
ADDITIONAL GRADING CHARACTERISTICS
Optical Effect .................................................................................................. Opaliscence
Origin .......................................................................................................................... Ethiopia
Origin determination is an expert opinion based on microscopic examination, spectroscopic features and
chemical trace element analysis.
COMMENTS
No indications of treatment.
20 July, 2025
33768564

No evidence of treatment

1 pcs  White Opal  - 11.56 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

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Object

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Country of origin

No origin given

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Certification

International Gemological Institute (IGI)

International Colored Gemstone Association (ICA GemLab)

Antwerp Laboratory for Gemstone Testing (ALGT)

Instituto Gemólogico Español (IGE)

Gemological Institute of America (GIA)

Gem Report Antwerp (GRA)

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GEM-TECH Istituto Gemmologico

No laboratory report

Istituto Gemmologico Italiano (IGI)

Laboratoire Français de Gemmologie (LFG)

Colour

Blue

Green

Yellow

Pink

Purple

Orange

Violet

Brown

White

Multicolour

Grey

Bi-colour

Colourless

Oval

Mixed cut

Cushion

Pear

Modified brilliant cut

Octagon

Faceted cut

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Brilliant cut

Cabochon cut

Round

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Modified cut

Rectangle

Fancy

Triangle

Square

Pear shape cut

Marquise

Squared emerald cut

Drop

Cut cornered square

Radiant

Clarity

Eye clean

Slight

Moderate

Loupe clean

Heavy

Severe

Treatment

Heat treatment

No heat treatment

Commonly heated with no evidence of treatment

Oiling

Not specified in the report

Commonly irradiated with no evidence of treatment

Clarity enhancement

Irradiation

Fracture healing / filling

Gemstone transparency

Transparent

Semi-transparent

Translucent

Semi-translucent

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Pearl luster

Excellent

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Good

Fair

Poor

Optical effect (gemstones)

Colour change

Play of colour

Opalescence

Fluorescence

Asterism

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1 pcs White Opal - 11.56 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

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