Aber Diamond Corporation (; ) is a Toronto, Canada specialist diamond mining and retail company.

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 Aber’s joint venture partner, Diavik Diamond Mines Inc., a subsidiary of Rio Tinto Group. The mine began producing diamonds in November 2002.

Aber’s participation in the retail segment of the diamond pipeline is by means of its 51% controlling interest in Harry Winston, which they purchased in 2004. As of October 2006, Aber has a 100% ownership in Harry Winston.

Aside from its corporate office in Toronto, Aber Diamond also has a rough diamond sorting faciilty in Toronto and a marketing office in Antwerp, Belgium. Aber Diamond sells Tiffany & Co. about 25% of the diamonds in Aber’s share and sells the remainder on the Antwerp open diamond market through its rough diamond dealer subsidiary, Aber International.