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Ghene Menezes

ALGT Colored Stone Identification Report n. 63991656 (29 January, 2026)
Natural Zoisite
Tanzanite
Oval Shape, Mixed Cut
n. 4 stones
Total Carat Weight 2.62
Average Carat Weight 0.65
Light Purplish Blue
Transparent
Origin from Tanzania
Heated

Tanzania - Heat treatment-  Lab report: 63991656

4 pcs  Blue Tanzanite  - 2.62 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

Gemstones

Reserve price

No reserve price

Closing date

Sunday

Monday

Wednesday

Tuesday

Thursday

18 September

19 September

20 September

Budget

From

Location

Thailand

India

The Netherlands

Spain

Germany

Italy

Portugal

United Kingdom

Singapore

France

Hong Kong

Belgium

United States

Greece

Poland

Israel

Switzerland

Canary Islands

Austria

Bulgaria

Taiwan

Slovak Republic

Norway

Czech Republic

Sweden

Object

Faceted gemstone

Gemstone cabochon

Country of origin

No origin given

Zambia

Tanzania

Sri Lanka

Myanmar/Burma

Madagascar

Brazil

Africa

Ethiopia

Mozambique

Unknown

Australia

Russia

Türkiye

Afghanistan

Colombia

Pakistan

Vietnam

Mexico

Nigeria

Asia

Stone

Sapphire

Emerald

Tanzanite

Spinel

Aquamarine

Ruby

Tsavorite

Topaz

Tourmaline

Opal

Garnet

Kunzite

Alexandrite

Amethyst

Fluorite

Tourmaline paraiba

Peridot

Rhodolite

Beryl

Sphalerite

Citrine

Morganite

Star Sapphire

Zircon

Sapphire padparadscha

Certification

International Gemological Institute (IGI)

International Colored Gemstone Association (ICA GemLab)

Antwerp Laboratory for Gemstone Testing (ALGT)

Instituto Gemólogico Español (IGE)

Gem Report Antwerp (GRA)

Gemological Institute of America (GIA)

Bellerophon Gemlab

Lotus Gemology

Gem research Swiss Lab (GRS)

Asian Institute of Gemological Sciences (AIGS)

Guild Gem Laboratory

Istituto Gemmologico Italiano (IGI)

GEM-TECH Istituto Gemmologico

No laboratory report

Colour

Green

Blue

Pink

Yellow

Violet

Purple

Orange

Brown

White

Multicolour

Bi-colour

Grey

Colourless

Black

Mixed cut

Oval

Cushion

Pear

Modified brilliant cut

Step cut

Octagon

Emerald cut

Faceted cut

Brilliant cut

Cabochon cut

Round

Modified cut

Triangle

Heart

Square

Rectangle

Pear shape cut

Marquise

Cut cornered square

Fancy

Fantasy

Kite

Baguette cut

Clarity

Eye clean

Slight

Moderate

Loupe clean

Heavy

Severe

Treatment

No evidence of treatment

No heat treatment

Heat treatment

Commonly heated with no evidence of treatment

Oiling

Not specified in the report

Clarity enhancement

Commonly irradiated with no evidence of treatment

Irradiation

Fracture healing / filling

Gemstone transparency

Transparent

Semi-transparent

Translucent

Semi-translucent

Optical effect (gemstones)

Colour change

Play of colour

Asterism

Fluorescence

Opalescence

Adularescence

Chatoyancy

Iridescence

Pearl luster

Good

Excellent

Very good

Gemstones

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4 pcs Blue Tanzanite - 2.62 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

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