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28 June, 2023

Algt Colored Stone Identification Report # 26027702

Identification

Species ................................................................................ Natural Quartz
Variety ............................................................................................ Amethyst

Description

Shape & Cutting Style ................. Modified Marquise, Mixed Cut
Measurements ............................................ 24.45 X 14.35 X 9.90 Mm
Carat Weight ........................................................................... 19.74 Carat
Color ...................................................................................................... Purple
Transparency ......................................................................... Transparent

Comments

No Indication Of Treatment.

High precision cut - ALGT (B)

(No-Reserve) Purple Amethyst - 19.74 ct

Gemstones

Reserve price

No reserve price

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Sunday

Monday

Wednesday

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7 March

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Location

Thailand

Germany

Spain

The Netherlands

India

Italy

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Portugal

Singapore

United Kingdom

Belgium

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Switzerland

Poland

Sweden

Ireland

Hong Kong

United States

Bulgaria

Slovak Republic

Cyprus

Canary Islands

Norway

Taiwan

Austria

Object

Faceted gemstone

Gemstone cabochon

Mineral cabochon

Country of origin

No origin given

Zambia

Sri Lanka

Tanzania

Myanmar/Burma

Ethiopia

Colombia

Mozambique

Africa

Madagascar

Brazil

Pakistan

Russia

Türkiye

Nigeria

Afghanistan

Unknown

Bolivia

Mali

Namibia

Asia

Kenya

Stone

Sapphire

Emerald

Spinel

Tanzanite

Opal

Aquamarine

Topaz

Tourmaline

Kunzite

Peridot

Garnet

Ruby

Amethyst

Tsavorite

Zircon

Citrine

Tourmaline paraiba

Sphalerite

Fluorite

Sapphire padparadscha

Alexandrite

Apatite

Spodumene

Ametrine

Demantoid

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

Lotus Gemology

Gem research Swiss Lab (GRS)

Asian Institute of Gemological Sciences (AIGS)

Guild Gem Laboratory

Netherlands Gem Laboratory (NEL)

Gübelin Gem Lab

Istituto Gemmologico Italiano (IGI)

GEM-TECH Istituto Gemmologico

Gemewizard Gemological Laboratory (GWLab)

Anchor Cert

Deutsche Stiftung Edelsteinforschung (DSEF)

Colour

Green

Blue

Pink

Violet

Purple

Yellow

Orange

White

Multicolour

Brown

Grey

Bi-colour

Colourless

Black

Oval

Mixed cut

Cushion

Pear

Octagon

Modified brilliant cut

Step cut

Faceted cut

Brilliant cut

Emerald cut

Round

Cabochon cut

Heart

Rectangle

Square

Modified cut

Fancy

Triangle

Pear shape cut

Drop

Marquise

Cut cornered square

Mixed shape

Squared emerald cut

Clarity

Eye clean

Slight

Moderate

Loupe clean

Heavy

Severe

Mineral

Nephrite

Mineral form

Cabochon

Pearl luster

Excellent

Very good

Good

Fair

Gemstone transparency

Transparent

Semi-transparent

Translucent

Semi-translucent

Opaque

Optical effect (gemstones)

Colour change

Play of colour

Opalescence

Fluorescence

Tenebrescence

Chatoyancy

Iridescence

Gemstones

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(No-Reserve) Purple Amethyst - 19.74 ct

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