Ms. Jacqueline Allison reports

DOMINION DIAMOND SHAREHOLDERS APPROVE TRANSACTION WITH THE WASHINGTON COMPANIES

Dominion Diamond Corp.'s shareholders, at a special meeting held earlier today, overwhelmingly approved the previously announced plan of arrangement pursuant to which Northwest Acquisitions ULC, an entity affiliated with The Washington Companies, has agreed to acquire all of the issued and outstanding common shares of the company for $14.25 (U.S.) per share in cash.

Approximately 99.32 per cent of the shares represented at the meeting in person or by proxy, were voted in favour of the special resolution approving the arrangement. Details of the voting results will be filed under the company's profile on SEDAR and on EDGAR.

The company intends to apply for the final order of the Ontario Superior Court of Justice (Commercial List) to approve the arrangement on Sept. 22, 2017. The closing of the arrangement remains subject to the company having a minimum cash balance of $150-million (U.S.) if closing occurs on or before Nov. 30, 2017, or $200-million (U.S.) if closing occurs after Nov. 30, 2017, and certain other customary closing conditions, including court approval and the receipt of Investment Canada Act (Canada) approval. Assuming the timely satisfaction of these closing conditions, the arrangement is expected to close in the fourth quarter of calendar 2017.

Shareholders who have questions or require assistance with submitting their shares to the arrangement, including with respect to completing the applicable letter of transmittal, are asked to contact AST Trust Company (Canada), who is acting as depositary under the arrangement, at 1-800-387-0825 (toll-free in North America) or at 416-682-3860 (collect outside North America), or by e-mail at inquiries@canstockta.com.

About Dominion Diamond Corp.

Dominion Diamond is a Canadian mining company and one of the world's largest producers and suppliers of premium rough diamond assortments to the global market. The company operates the Ekati diamond mine, in which it owns a controlling interest, and owns 40 per cent of the Diavik diamond mine, both of which are located in the low-political-risk environment of the Northwest Territories in Canada. It also has world-class sorting and selling operations in Canada, Belgium and India.

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