Located in Bangkok, the laboratory is Gemological Science International’s 14th location worldwide.
157-Carat Canadian Diamond Goes Up for Sale
Dubbed “Polaris,” the rough diamond is the Gahcho Kué mine in Canada’s Northwest Territories’ largest gem-quality diamond recovered to date.

Mackie declined to provide a pre-sale estimate, noting the lack of comparisons available due to the diamond’s size. The stone is the largest rough diamond the mine has yielded in its approximately four-year history.
RELATED CONTENT: Take a Peek at the Largest Diamond Found in North America
The Polaris is part of Mountain Province’s February sale being conducted now at Bonas Group’s offices in Antwerp.
In addition to Polaris, the sale includes more than 30 high-quality diamonds weighing 10.8 carats or more, the company said, as well as Mountain Province’s customary run-of-mine assortments.
Mountain Province Diamonds operates Gahcho Kué in 49/51 percent joint venture with De Beers Canada.
The mine started production in September 2016 and, the company said, has established itself as a source of larger, high-quality diamonds.
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