GSI: Gemological Science International
About GSI: Gemological Science International
Gemological Science International (GSI) is the only major gemological organization established in the 21st century. Founded in 2005 in New York City, it has grown to become one of the largest gemological entities in the world with laboratory facilities spanning four continents.
Utilizing cutting-edge processes and proprietary technologies, along with a commitment to the highest ethical and responsible standards, GSI provides manufacturers and retailers globally with a wide range of grading reports and services for diamonds (both natural and lab-grown), colored gemstones, and jewelry. GSI is the leader in the testing and detection of undisclosed lab-grown diamonds in finished jewelry. The company also offers a variety of educational programs to the trade and has a dedicated internationally recognized team of researchers, scientists, and professionals committed to advancing gemological research in the industry.
Contacts
New York
Gemological Science International
New York Laboratory Department
551 5th Avenue
Suite 601, 6th Floor
New York, NY 10176
Phone: (212) 207-4140
Dubai
Gemological Science International
AG-19-J
Silver Tower (AG Tower)
Cluster I Jumeirah Lake Towers Dubai, UAE
Phone: +971-0-45573088
Hong Kong
Gemological Science International
Kaiser estate phase 1
41 Man Yue St
A3, 5th floor
Hung Hom, Kowloon
Phone: +852-2-122-9378
Bangkok
Gemological Science International
Vorawat Building
849, Si Lom Road
Suite 602, 6th Floor
Bang Rak, Bangkok, 10500
Phone: +66-02-235-6421
ONE BKC, Mumbai
Gemological Science International
India Headquaters
One BKC, G Block
Unit 1008, 10th Floor, C Wing
BKC, Bandra East, Maharashtra, Mumbai, 400051
Phone: +91-22-66930-400/489
SEEPZ, Mumbai
Gemological Science International
SDF VII
Unit 602, 5th Floor
SEEPZ SEZ SEEPZ, Maharashtra Andheri(E) Mumbai, 400097
Phone: +91-22-69160-400/499
MIDC, Mumbai
Gemological Science International
Options Primo Marol Industrial Area
MIDC Cross Rd No 21
1st Floor, Office no. 111
Andheri East, Maharashtra, Mumbai, 400093
Phone: +91-22-69175-103/110
MEGA CFC, Mumbai
Gemological Science International
Bharat Ratnam – Mega Common, Facilitation Centre
Gate No. 4 & 5
SEEPZ Special Economic Zone Andheri East, Maharashtra, Mumbai, 400096
Phone: +91-22-69131-118
Surat
Gemological Science International
Diamond World
Mini Bazaar
C-602, 6th Floor
Varachha Road, Gujarat, Surat, 395006
Phone: +91-261-2550-354
SDB, Surat
Gemological Science International
Surat Diamond Bourse
J 102, Plot No. 177
Dream City, Near Surat International Exhibition & Convention Center
Khajod Chowk, Gujarat, Khajod Surat, 395007
Phone: +91-261-2550-354
Jaipur
Gemological Science International
Mirza Ismail Road (MI Road)
2nd Floor
Rajasthan Chamber Bhawan, Rajasthan, Jaipur, 302003
Phone: +91-141-2574-650
Bengaluru
Gemological Science International
136, Cears Plaza
2nd Floor, Office # 202A & 203A
Residency Road, Karnataka, Bengaluru, 560025
Thrissur
Gemological Science International
Center Point MG Road
3rd Floor
Kerala, Poothole Thrissur, 680004
Phone: +91-487-4055-444
Indore
Gemological Science International
Trade Centre
18 - Mahatma Gandhi Rd
228-B, 2nd Floor
South Tukoganj, Madhya Pradesh, Indore, 452001
Phone: +91-731-4065-573
Kolkata
Gemological Science International
FMC FORTUNA
A 12B, AJC Bose Road
234/3A, 2nd Floor
West Bengal, Kolkata, 700020
Phone: +91-033-45212-593
Digital Presence
News
Tanishq Partners with GSI to Deepen Gemological Expertise Across Teams
In a step towards enriching customer experiences with meaningful knowledge and trust, Tanishq, India’s most trusted jewellery brand from Titan Company Limited (a Tata Group company), has collaborated with Gemological Science International (GSI) to bring specialized gemological sales training to i...
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GSI Detects Undisclosed Lab-Grown Diamonds in Brown Diamond Jewelry Amid Rising Demand for Off-Color Naturals
Gemological Science International (GSI), one of the world’s largest gemological organizations, has identified undisclosed lab-grown diamonds in jewelry set with natural brown diamonds. The discovery comes at a critical time, as the global jewelry trade increasingly promotes off-color natural diam...
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GEMOLOGICAL SCIENCE INTERNATIONAL (GSI) EXPANDS GLOBAL FOOTPRINT WITH NEW LAB IN BANGKOK, THAILAND
Bangkok, Thailand — Gemological Science International (GSI), one of the largest and most technologically advanced gemological organizations in the world, proudly announces the opening of its newest laboratory in Bangkok, Thailand — the 14th in its global network. Strategically located in the hear...
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GSI’s Colored Stone Professional (CSP) Programme Explores New Mine in Sri Lanka
GSI’s Colored Stone Professional (CSP) Diploma programme, recognised for its innovative combination of theoretical knowledge and practical, real-world experiences, recently embarked on an educational mine visit to Sri Lanka’s renowned Rakwana Gem Deposit. As part of the recent CSP student cohort,...
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GSI’s Launches State-of-the-art Laboratory in Kolkata Bringing International Expertise to the Eastern Region
Located near the jewellery hub of Camac Street, the lab is strategically poised to provide jewellery manufacturers, traders and retailers with GSI‘s world renowned services in their city Kolkata, 23 September, 2025: Gemological Science International (GSI) proudly announced the official launch of ...
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