The company holds a 40% stake in the Diavik Diamonds Project. Production at the Diavik Diamond Mine, Canada's second diamond mine, is operated by Harry Winston's joint venture partner, Diavik Diamond Mines Inc., a subsidiary of Rio Tinto Group. The mine began producing diamonds in November 2002.
Harry Winston's participation in the retail segment of the diamond pipeline is by means of its ownership of the namesake chain.
Aside from its corporate office in Toronto, Harry Winston also has a rough diamond sorting facility in Toronto and a marketing office in Antwerp, Belgium. Harry Winston sells Tiffany & Co. about 25% of the diamonds in Winstons's share and sells the remainder on the Antwerp open diamond market through its rough diamond dealer subsidiary, Aber International.