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Almost all gemstones over $200 in value come with Free Certification from the leading gem-testing labs. Please look at the individual product listing pages for more information on the type of certificate accompanying the gem. We provide certificates issued by the following labs, which are the best in the business (click on the name for more details):




Gemological Institute of India


About GII: The Gemmological Institute of India (GII) is the first non profit research and educational organisation in the field of Gemmology in India. It is a public institution founded by the Gem and Jewellery Exporters' Association, Mumbai. GII is Government of India recognized as well as CIBJO recognized, and is at present the foremost gem-testing laboratory in India.


Address: 304, Sukh Sagar Building, N.S. Patkar Marg, Opera House, Mumbai 400007, India


Telephone: +91-22-66519030 / 66519031


Fax: +91-22-23679189


Email: [email protected] / [email protected]


Website: http://www.giionline.com


Sample Certificate:

GII Sample Certificate




Asian Institute of Gemological Sciences (AIGS)


About AIGS: The AIGS Gemological Laboratory was the first professional gemological laboratory to be established in Asia (1978). The AIGS Gemological Laboratory is a private, independant gemological laboratory. They are members of the Thai Gem and Jewelry Traders Association (TGJTA), and The International Colored Gemstone Association (ICA). It is very well known for its expertise in colored gemstones, especially Ruby, Sapphire, Emerald, Jade and rare stones but it also provides identification and grading services for diamonds and jewelry. The AIGS Gem Laboratory is already equiped with advanced laboratory instruments such as FTIR, EDXRF, UV-Vis etc.


Address: 919/1 Silom Rd, Jewelry Trade Center, 48th Fl., Bangrak, Bangkok 10500, Thailand

Telephone: +662-2674325


Fax: +662-2674327


Email: [email protected]


Website: http://www.aigslaboratory.com/


Report Authenticity Check: http://aigslaboratory.com/CertificateAuthenticityCheck.aspx


Sample E-Report:

Sample E-Certificate


View our collection of AIGS-Certified Gemstones 




GemResearch SwissLab (G.R.S.)


About GRS: Dr. A. Peretti graduated from the Institute of Mineralogy and Petrography at the Swiss Federal Institute of Technology (SFIT) in Zurich (Switzerland) with a PhD on “Mineral formation in the Alps”. In 1996 he founded GRS - an internationally active private gemological research company. The professional activities of Dr. A. Peretti have been certified by the European Federation of Geologists (Paris, France), and he was awarded the title "European Geologist" in 2000. Currently, he is the director and owner of GRS Switzerland, Thailand and Sri Lanka.


Addresses & Contact Details

GRS Gemresearch Swisslab AG
P.O. Box 3628, 6002 Lucerne, Switzerland
Public limited company of Canton of Lucerne, Switzerland
Director: Dr. A. Peretti, FGG, FGA (Gemmologist)


GRS Geneva Laboratory
Rue du marché 12, 1204 Geneva, Switzerland
Contact person: Mr. W. Bieri

Tel: +41-22-310-72-32 / 33 

Fax: +41-22-310-72-34

GRS Thailand Co., Ltd.
Jewelry Trade Center, Room 919/257, 20th Floor, North Tower
Silom Road, Bangrak, Bangkok 10500, Thailand

Tel: +662-237-5898 / 630-0112

Fax: +662-237-5899 / 630-0114



Email: [email protected]


Website: http://www.gemresearch.ch/


Report Verification System: http://gemresearch.ch/Search.php


Sample Certificate: 

GRS Sample Certificate


View our collection of GRS-Certified Gemstones 




International Gemological Institute (IGI)


About IGI: Established in Antwerp, New York, Hong Kong, Mumbai, Bangkok, Tokyo, Dubai, Toronto, Los Angeles, Tel Aviv and Cavalese, IGI is the world's largest independent gem certification and appraisal institute renowned for its quality services, extensive experience and know-how. 


Addresses & Contact Details:

IGI Belgium - World Head Office
Schupstraat 1
2018 Antwerp
Tel: +32-3-231.68.45
Fax: +32-3-232.07.58
Email: [email protected] 
IGI Italy - School of Gemology
Via O. Sala 26
32040 Borca di Cadore (Bl.)
Tel. & Fax.: +39-043-548.26.19
Tel.: +39-0462-34.26.62
Email : [email protected]
IGI - New York
589 Fifth Avenue
New York, NY 10017
Tel: +1-212-753-7100
Fax: +1-212-753-7759
Email: [email protected]
IGI - Los Angeles
550 South Hill Street
Los Angeles, CA 90013
Tel: +1-213-955-0008
Fax:: +1-213-955-8060
Email: [email protected]
IGI Canada
27 Queen Street East
Floor 12
Toronto, ON M5C 2M6
Tel: +1-416-594-2500
Fax: +1-416-594-9671
Email: [email protected]
IGI Dubai
Goldland M24
PO Box 57664
Deira, Dubai
Tel: +971-4-235-0543
Fax: +971-4-235-0542
Email: [email protected]
IGI Tel Aviv
Yahalom Building, room 1165
Bezalel Street 54
52520 Ramat Gan
Tel: +972-3-756-4200
Fax: +972-3-613-7231
Email:[email protected]
IGI India
404, Mani Mahal
11/21 Mathew Road, Opera House
Mumbai 400 004
Tel: +91-22-4035-2550
Fax: +91-22-2364-2861
Email: [email protected]
IGI Japan
UT Bldg.
2-21-13 Higashi Ueno
Tel: +81-3-5807 2958
Fax: +81-3-5807 2959
Email: [email protected]
IGI Hong Kong
Suite 302, Aon China Building
29 Queen's Road C
Tel. +852-
Fax. +852-
Email : [email protected] 
IGI Thailand
BGI Building,
9 Soi Charoen Krung
36, New Road
Bangkok 10500
Tel: +66-2-630.67.26
Fax: +66-2-630.67.28
Email: [email protected]


Website: http://www.igiworldwide.com


Online Data Retrieval: http://www.igiworldwide.com/en/onl_data.htm


Sample Reports: 

 IGI Sample Report


IGI Sample Report




HKD Diamond Laboratories


About HKD: HKD Diamond Laboratories opened its first of three laboratories in 1994 in the heart of the main trading center of gemstone, diamonds and jewellery in Toronto, Canada. The principal owners are Hemdeep Patel, Graduate Gemologist (GIA), B.Sc. in Astronomy and Physic and Kamal Patel, Graduate Gemologist (GIA), B.A. (Honours). Aside from their formal gemological education from GIA, they are the third generation in the gem and diamond business. They are also members of the GIA Alumni, Associate Member of the Canadian Jewellers Institute, Canadian Jewellers Association and Canada Diamond Code of Conduct. HKD Toronto has been providing full gemological services for Canadian marketplace. The services provided are aimed for a wide range of customers: end user consumers, jewellery manufacturers, jewellery chain stores, and diamond and gemstone traders.


Addresses & Contact Details:

Mumbai, India
543, Panchratna, Opera House
Mumbai- 400 004
Tel. +91-22-2368-3336
Fax. +91-22-2368-3337
Toronto, Canada 
21 Dundas Square, Suite 807,
Toronto, Ontario
Canada M5B 1B7
Tel. +1-416-368-7266
Fax. +1-416-368-8527


Email: [email protected]


Website: http://www.hkdlab.com/


Sample Report

HKD Certificate Sample


View our collection of HKD-Certified Gemstones 




Gemological Institute of America (GIA)


About GIA: Established in 1931, the Gemological Institute of America is the world’s foremost authority on diamonds, colored stones, and pearls. The GIA Laboratory is the world’s most trusted name in diamond grading and gemstone identification. With facilities in New York, California, Bangkok, Mumbai, Johannesburg, and Gaborone as well as six international service centers, the GIA Laboratory is regarded as the world’s highest authority in gemology.


Addresses & Contact Details: http://www.gia.edu/nav/toolbar/find-locations/index.html


Website: http://www.gia.edu/lab-reports-services/index.html


Sample Gem Report: http://www.gia.edu/_Microsites/ReportAnatomy/ident_report.htm


View our collection of GIA-Certified Gemstones 



Also See: Grading Scale

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  • Certification from Asian Institute of Gemological Sciences (AIGS)
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