GIA in India
NKGSB Co-operative Bank Building, Plot No. C-10, G Block, Bandra Kurla Complex (BKC), Bandra East, Mumbai 400051, Maharashtra.
Located in the Bandra Kurla Complex, Mumbai's financial district and the centre of India's diamond trading infrastructure.
Physical: 10× loupe on the diamond's girdle, the GIA report number is laser-inscribed. Must match the certificate number and the online verification result.
Source: GIA official website, gia.edu/locations/mumbai. Address and services as of early 2026, verify current details at gia.edu before visiting or submitting.
GIA global network, for context
GIA operates laboratories in: Carlsbad, California (headquarters); New York; Antwerp; London; Ramat Gan (Israel); Mumbai; Bangkok; Tokyo; Hong Kong; Taipei; Johannesburg; and other locations. All GIA laboratories apply identical grading standards and are calibrated against Carlsbad master references. A diamond graded at GIA Mumbai receives the same grade as it would at GIA Carlsbad for the same actual quality (GIA institutional information, gia.edu/gia-about).
IGI in India
Panchratna Building, Opera House, Mumbai 400004, Maharashtra.
Located in the Opera House area near Zaveri Bazaar, the heart of Mumbai's jewellery and diamond retail and wholesale district. Accessible to the full range of the trade from small retailers to large manufacturers.
Physical: 10× loupe on the girdle, IGI report number is laser-inscribed. Must match the certificate and the online verification.
Source: IGI official website, igi.org. IGI also operates offices in Delhi, Jaipur, Coimbatore, and other India locations, see igi.org/india for the complete current list. All addresses and contact details should be verified at igi.org before submitting or visiting.
Verify a certificate online: step by step
| Certificate type | Verification URL | What it confirms | Time needed |
|---|---|---|---|
| GIA Diamond Grading Report | gia.edu/report-check | Report number validity, all grades, measurements, carat weight, treatment status | 30 seconds |
| IGI Diamond Grading Report | igi.org (use certificate verification) | Report number validity, all grades, measurements, carat weight | 30 seconds |
After online verification, always also confirm the girdle inscription under a 10× loupe. The physical inscription on the girdle is the link between the specific diamond in hand and the certificate. Online verification confirms the certificate is genuine; girdle confirmation confirms this specific stone matches this specific certificate.
Which laboratory for which purchase
| Purchase type | Recommended laboratory | Reason |
|---|---|---|
| Natural diamond above ₹5L | GIA only | Grade accuracy essential at this value; IGI grade gap is material (₹50K–₹2L+ exposure) |
| Natural diamond ₹1L–₹5L | GIA preferred; IGI acceptable | Grade gap exposure manageable but increasing, GIA preferred above ₹3L |
| Natural diamond below ₹1L | IGI acceptable | Practical standard for this range; GIA fee represents higher proportion of purchase value |
| Lab-grown diamond, any value | IGI is the primary standard | IGI dominates lab-grown certification; consistent grading for LGD; GIA lab-grown also valid |
| Any certificate not GIA/IGI above ₹50K | Reject and require GIA or IGI | House labs and minor labs provide no reliable quality assurance |
Source: Claradiam certificate rule based on documented grade accuracy data. See GIA vs IGI guide for full analysis.
Sources for this directory
GIA India laboratory information. Available at gia.edu/locations/mumbai and gia.edu/india. Gemological Institute of America. [Mumbai BKC address, services, submission procedures, verification service at gia.edu/report-check.]
IGI India laboratory information. Available at igi.org and igi.org/india. International Gemological Institute. [Mumbai Opera House/Zaveri Bazaar location, Surat office, India services, verification service at igi.org.]
GJEPC (Gem and Jewellery Export Promotion Council). gjepc.org, Mumbai. [India diamond industry context; Surat cutting industry reference for IGI Surat significance.]