Market Overview

ISS and Glass Lewis Support Plan of Arrangement Between Dominion Diamond and The Washington Companies

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Dominion Diamond Corporation (TSX:DDC, NYSE:DDC) (the "Company" or
"Dominion") today announced that Institutional Shareholder Services,
Inc. ("ISS") and Glass, Lewis & Co., LLC ("Glass Lewis"), two leading
independent proxy advisory firms, have both recommended that
shareholders of Dominion vote FOR the special resolution (the
"Arrangement Resolution") at the upcoming special meeting (the
"Meeting") of the shareholders to approve a statutory Plan of
Arrangement (the "Arrangement") pursuant to which Northwest Acquisitions
ULC, an entity affiliated with The Washington Companies, will acquire
all of the issued and outstanding common shares of Dominion for a cash
consideration of US$14.25 per share.

In their analysis, both ISS and Glass Lewis acknowledged the substantial
premium for shareholders, the certainty of value and liquidity to
shareholders due to the all-cash consideration, and the robust auction
process, as factors supporting a FOR recommendation.

The Board of Directors of the Company, based in part on the
recommendation of the special committee of independent directors, has
unanimously determined that the Arrangement is in the best interests of
the Company and has unanimously recommended that the shareholders vote FOR
the Arrangement Resolution.

Your vote is very important. Shareholders should vote FOR the
Arrangement Resolution using the proxy or voting instruction form sent
to them in advance of the voting deadline of 10:00 a.m. (Calgary time)
on September 15, 2017.
The meeting of Dominion shareholders to
approve the Arrangement is scheduled for 10:00 a.m. (Calgary time) on
September 19, 2017, at 444-7 Avenue SW, 2nd Floor, Conference Room A and
B, Calgary, Alberta.

Copies of the Notice of Special Meeting, the Management Information
Circular of the Company dated August 15, 2017, and related documents
have been filed under Dominion's profile on the System for Electronic
Document Analysis and Retrieval (SEDAR) at www.sedar.com
as well as the Electronic Data Gathering, Analysis, and Retrieval system
(EDGAR) at https://www.sec.gov/edgar/.

Shareholders who have questions regarding the Arrangement or require
assistance with voting may contact the Company's strategic shareholder
advisor and proxy solicitation agent below:

Kingsdale Advisors
Toll free (in North America):
1-888-518-6805
International collect (outside North America):
1-416-867-2272
Email: contactus@kingsdaleadvisors.com

About Dominion Diamond Corporation
Dominion
Diamond Corporation 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% 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.

Forward-Looking Statements
Certain statements
included in this news release may be considered forward-looking. Such
statements involve known and unknown risks, uncertainties and other
factors that may cause actual results, performance or achievements to be
materially different from those implied by such statements, and
therefore these statements should not be read as guarantees of future
performance or results. All forward-looking statements are based on the
Company's current beliefs as well as assumptions made by and information
currently available to the Company.

Readers are cautioned not to place undue reliance on these
forward-looking statements, which speak only as of the date of this news
release. Due to risks and uncertainties, including the risks and
uncertainties identified by the Company in its public securities filings
available at
www.sec.gov
and
www.sedar.com,
actual events may differ materially from current expectations. The
Company disclaims any intention or obligation to update or revise any
forward-looking statements, whether as a result of new information,
future events or otherwise, except as required by law.

For more information, please visit www.ddcorp.ca,
or contact:
Investors:

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