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** This gemstone presents the rare quality of being Internally Flawless**

Description : One transparent gemstone
Weight : 11,546 ct
Measurements : 17,56 x 12,58 x 7,89 mm
Shape : Pear 
Identification : Natural Tanzanite 
Colour : Vivid Violetish Blue
Colour Stability : Stable 

Comment : No Indications of any treatment 
Geographic Origin : Tanzania 
Fluorescence : None 

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Tanzania - No evidence of treatment

Blue Tanzanite  - 11.55 ct - Bellerophon Gemlab

Gemstones

Reserve price

No reserve price

Closing date

tomorrow

Thursday

Friday

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10 March

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Object

Faceted gemstone

Gemstone cabochon

Country of origin

No origin given

Zambia

Sri Lanka

Tanzania

Myanmar/Burma

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Africa

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Unknown

Stone

Sapphire

Emerald

Tanzanite

Spinel

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Topaz

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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)

Bellerophon Gemlab

Gem research Swiss Lab (GRS)

Asian Institute of Gemological Sciences (AIGS)

Lotus Gemology

Guild Gem Laboratory

Gemewizard Gemological Laboratory (GWLab)

GEM-TECH Istituto Gemmologico

Gübelin Gem Lab

Istituto Gemmologico Italiano (IGI)

No laboratory report

Colour

Green

Blue

Yellow

Pink

Purple

Violet

Orange

Brown

White

Multicolour

Bi-colour

Grey

Colourless

Oval

Mixed cut

Cushion

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Pear shape cut

Marquise

Radiant

Drop

Fancy

Squared emerald cut

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Clarity

Eye clean

Slight

Moderate

Loupe clean

Heavy

Severe

Treatment

No evidence of treatment

No heat treatment

Oiling

Commonly heated with no evidence of treatment

Heat treatment

Not specified in the report

Clarity enhancement

Commonly irradiated with no evidence of treatment

Irradiation

Surface diffusion

Impregnation

Fracture healing / filling

Gemstone transparency

Transparent

Semi-transparent

Translucent

Semi-translucent

Opaque

Pearl luster

Excellent

Very good

Good

Fair

Optical effect (gemstones)

Colour change

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Opalescence

Fluorescence

Tenebrescence

Asterism

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Blue Tanzanite - 11.55 ct - Bellerophon Gemlab

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