IGI launches diamond-typing service

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IGI launches diamond-typing service

September 04, 2008

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New York—The International Gemological Institute (IGI) is offering a new service that can identify a diamond's type.

The service, known as IGI Diamond Typing and available via the New York laboratory, was developed in response to client demand and industry needs.

According to a release from the IGI, diamonds are one of four major types: Ia, Ib, IIa or IIb.

Knowing a diamond's type is integral in determining the stone's color and can distinguish likely candidates for the high-pressure, high-temperature (HPHT) color-treatment process and/or artificial irradiation.

If a diamond is determined fit for color treatment, knowing its type can help establish the proper treatment conditions (temperature, pressure, irradiation, etc.) and help to determine what color the diamond will be after treatment.

These diamond types are based on the concentration levels of nitrogen and/or boron in a given stone, as well as the state of aggregation of present nitrogen within its crystal lattice.

In addition, diamond typing plays a key role in distinguishing true "Canary" diamonds (type Ib) and true Golconda diamonds (type IIa).

"Diamond typing is a crucial first step in the color treatment of diamonds, and this new service can assist both our clients and the industry as a whole," IGI President and CEO Jerry Ehrenwald said in a media release.

New York-based IGI was established in 1975 and has locations in Antwerp, Belgium; Bangkok, Thailand; Dubai, United Arab Emirates; Hong Kong; Los Angeles; Kolkata, India; Mumbai, India; New Delhi, India; India's SEEPZ area; Tokyo; and Toronto.

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