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A list of stones and their Treatments
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Ametrine is not treated in any way
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AZOTIC TRATMENT OF QUARTZ AND TOPAZ
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Best Gemstones and Crystals For You
Buying gems On The Internet
Chemical Composition
Code of Ethics FTC
Color Healing For Gemstones
Colour Changing Gemstones
Compare Quartz and Topaz
Conversion Chart for Ring Sizes
Conversion Chart for Ring Sizes
Diamonds at trade minus 3.5%
DISCIPLINE GEMSTONE BUYER
Dowsing with Gemstone
Emeralds
Emeralds How To Buy Emeralds
Engagement rings
Feldspar
Garnet
Gem Structure Chart
Gem Weight
Gemstone Pyramids
Gemstone Testing In Australia
Gemstone Testing In Thailand
Gemstone Treatments
Gemstone Types
Gemstone Wands
Glass Filled Rubies
Gota De Aceite Emeralds
Hackmanite Gemstone Information
Healing With Gemstones
How To Care For Your Crystals and Gemstones
How To Test Amber
Jade How To Tell If Its Real
Jewelers Vigilance Committee
Jewellery cleaning tips n hints
Join Gem Society
Metaphysical - Stone Cleansing
Metaphysical Gemstone Properties
Moh's scale of hardness
Mother Of Pearl
Mystic quartz
News Article - Madagascar's sapphire rush
OTHER GEM TESTING LABORATORIES
Pearl Treatments
Pearl Value Factors
Prasiolite
Quartz information
Ring Sizes
Ruby How To Buy Ruby
Sapphire Information
STAR SAPPHIRE TREATMENTS
Star Stones - your starsign stones
Tahitian Pearls
Tanzanite
Tanzanite
The Four C's - Carats
The Four C's - Clarity
The Four C's - Color
The Four c's - Cut
Three tools handy for Gemstone appraisal
TOPAZ NATURAL AND TREATED:
Treatments
Weights & Measures

Gemological Institute of America (GIA)

5345 Armada DriveCarlsbad, California 92008Tel: (800) 421 7250www.gia.edu 

American Gem Trade Association (AGTA)

18 East 48th Street, Suite 502New York, New York 10017 USATel: (212) 752 1717

www.agta.org

 American Gem Society Laboratories (AGSL)

8917 West Sahara AvenueLas Vegas, Nevada 89117Tel: (702) 233 6120

www.agslab.com 

American Gemological Laboratories (AGL)

580 Fifth AvenueSuite 706New York, New York 10038Tel: (212) 704 0727

  European Gemological Laboratory USA (EGL)

6 West 48th StreetNew York, New York 10036Tel: (212) 730 7380

www.eglusa.com

 Gübelin Gem Laboratory Ltd. (GGL)

Maihofstrasse 1026006 Lucerne SwitzerlandTel: (+ 41) 41 / 429 17 17

www.gubelinlab.com 

Swiss Gemmological Institute (SSEF)

Falknerstrasse 9CH-4001 Basel, SwitzerlandTel: (+ 41) 61 262 06 40

www.ssef.ch Österreichische Gemmologische Gesellschaft

 (SSEF)Goldschlagstrasse

 101150 Wien (Vienna), AustriaTel: (+ 43) 01 231 22 38 od. 0676/310 40 66

www.oegemg.at 

Laboratoire Français de Gemmologie (LFG)

2, place de la Bourse75002 Paris, FranceTel: (+ 33) 1 40 26 25 45

www.diamants.ccip.fr 

Gemmological Institute of India (GII)

29 Gurukul Chambers187-189 Mumbadevi RoadBombay 400 002, IndiaTel: (+ 91) 22 2342 00 39

 www.giionline.com 

Gem Institute of Thailand (GIT)Gem Research and Testing BuildingPhayathai RoadBangkok 10330,

ThailandTel: (+ 66) 2 218 54 70-3

www.git.or.th   

AUSTRALIA

 

Gem studies laboratory

Sydney

Ph 612 9264 8788

gemstudy@ozemail.com

 

Symmetry

Price st Nerang

Queensland 07 5596 1775

Kym@symmetry.net.au

 

THAILAND

 

Gemological Hallmark International Co ltd

Jewellery Trade center 919 Silom rd

Bangkok Thailand 66 2236 2131

 

IGEC International gemology

State tower Silom Rd Bangkok

Thailand support@internationalgemology.com

 

Tokyo Gem laboratory

Rama Jewelery bldg

Silom rd Bankok Thailand

02 635 2030 2

 

BGL Bura Gemolical laboratory

Chantaburi Thailand

66 333 01118

 

Last Update: 14 Oct 2008