Laboratories

Five laboratories, one grading standard

Take-in counters are open to the trade and to private owners. Bring the goods and, if you have one, the existing report.

A dark instrument bench, a stereo microscope lit over a slate tray of small stones and tweezers, the counter running away into shadow.
A long row of grading benches seen down its length, gemmologists at microscopes along a window wall in bright daylight.

Surat

Principal laboratory
Diamond Bourse, Khajod, Surat 395010, Gujarat, India
Take-in hours
Mon to Sat, 10:00 to 18:00
An archive room lined with numbered record cabinets and a barred strongroom, a grading bench and microscope in the foreground.

Mumbai

Laboratory and archive
Bharat Diamond Bourse, Bandra Kurla Complex, Mumbai 400051, India
Take-in hours
Mon to Sat, 10:00 to 18:00
A compact high-floor laboratory with benches on three sides, city towers close outside the windows.

New York

Laboratory
580 Fifth Avenue, New York, NY 10036, United States
Take-in hours
Mon to Fri, 09:00 to 17:00
Gemmologists working under bench lamps at dusk, lit apartment towers filling the window behind them.

Hong Kong

Laboratory
Kowloon Bay, Kowloon, Hong Kong SAR
Take-in hours
Mon to Fri, 09:30 to 18:00
A quiet laboratory in pale wood and white, trays of coloured stones on the bench and snow-covered ground beyond the windows.

Toronto

Laboratory
55 Bloor Street West, Toronto, ON M4W 1A5, Canada
Take-in hours
Mon to Fri, 09:00 to 17:00
Diamond-set bands in white and yellow gold stacked on a dark reflective surface.

Send us your query

Questions about a report you hold, a submission you are planning, or a stone you have been offered. Include the report number if there is one.

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