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07 September, 2023

Algt Colored Stone Identification Report # 16108457

Identification

Species .................................................................................. Natural Topaz
Variety ......................................................................................... Blue Topaz

Description

Shape & Cutting Style ............. Rectangular Cushion, Mixed Cut
Measurements ......................................... 16.34 X 13.60 X 11.35 Mm
Carat Weight ........................................................................... 21.74 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.

===========================

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Shipping method
- We use the most reliable couriers, FedEx
- A tracking number will be provided for each shipment

Customs Formalities
- Customs and import fees are the sole responsibility of the buyer
- We cannot be held responsible for any charges incurred on importing jewelry to the buyer's country of residence

Special Notes for (French, Portuguese, and Canary Island) Customer

- Buyers from French, Portuguese, and Canary Islands need a customs agent broker to clear the shipment
- Please pay attention that usually a designated customs broker will have to be appointed by the client in order to release the package from customs.

Cancel/withdraw the Purchase item
- If the winning bidder decides to cancel/withdraw they will bear the risk, cost of all shipping, and return import duties of the seller

* Also, the shipping fee does NOT include customs and import fees. VAT and other customs fees are the sole responsibility of the buyer. To avoid shipping delays, please make sure that your catawiki shipping details are up to date.

Cushion - ALGT (B)

1 pcs (London Deep Blue) Topaz - 21.74 ct

Gemstones

Reserve price

No reserve price

Closing date

Sunday

Saturday

tomorrow

today

Monday

Tuesday

Wednesday

Budget

From

Location

Thailand

Spain

India

The Netherlands

Germany

Italy

Portugal

Singapore

Israel

Belgium

United Kingdom

France

Poland

Austria

Switzerland

Cyprus

Sweden

Bulgaria

Hong Kong

Greece

United States

Slovak Republic

Czech Republic

Canary Islands

Romania

Object

Faceted gemstone

Gemstone cabochon

Country of origin

No origin given

Zambia

Sri Lanka

Ethiopia

Tanzania

Pakistan

Colombia

Madagascar

Mozambique

Brazil

Myanmar/Burma

Nigeria

Africa

Afghanistan

Unknown

Türkiye

Russia

Mexico

Vietnam

Bolivia

Namibia

Stone

Sapphire

Emerald

Tanzanite

Spinel

Aquamarine

Opal

Amethyst

Tourmaline

Ruby

Topaz

Peridot

Kunzite

Garnet

Tsavorite

Citrine

Alexandrite

Fluorite

Tourmaline paraiba

Sphalerite

Ametrine

Spessartite

Fire Opal

Spodumene

Sapphire padparadscha

Rhodolite

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)

Bellerophon Gemlab

Lotus Gemology

Asian Institute of Gemological Sciences (AIGS)

Gem research Swiss Lab (GRS)

Guild Gem Laboratory

Istituto Gemmologico Italiano (IGI)

GEM-TECH Istituto Gemmologico

Gübelin Gem Lab

No laboratory report

Colour

Green

Blue

Yellow

Purple

Pink

Violet

Orange

Brown

White

Multicolour

Grey

Bi-colour

Colourless

Black

Mixed cut

Oval

Cushion

Pear

Octagon

Modified brilliant cut

Emerald cut

Faceted cut

Step cut

Brilliant cut

Cabochon cut

Round

Heart

Modified cut

Rectangle

Triangle

Square

Pear shape cut

Drop

Fancy

Cut cornered square

Marquise

Radiant

Mixed shape

Clarity

Eye clean

Loupe clean

Slight

Moderate

Heavy

Severe

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

Fracture healing / filling

Irradiation

Gemstone transparency

Transparent

Semi-transparent

Translucent

Semi-translucent

Opaque

Pearl luster

Excellent

Very good

Good

Fair

Optical effect (gemstones)

Colour change

Play of colour

Fluorescence

Opalescence

Tenebrescence

Asterism

Adularescence

Chatoyancy

Gemstones

This object is no longer available, but there’s still lots to explore

1 pcs (London Deep Blue) Topaz - 21.74 ct

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