Exhibit 99.1
| CST Trust Company |
| P.O. Box 4202, Postal Station A |
| Toronto, ON M5W 0E4 |
| Tel: 416.682.3800 |
| Fax: 1.877.715.0494 |
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| www.canstockta.com |
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| Global Resources•Local Service•Customized Solutions |
April 13, 2017
| Nova Scotia Securities Commission | Securities Commission of Newfoundland and Labrador |
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| Alberta Securities Commission | Saskatchewan Financial and Consumer Affairs Authority |
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| Manitoba Securities Commission | New Brunswick Financial and Consumer Services Commission |
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| Ontario Securities Commission | British Columbia Securities Commission |
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| Superintendent of Securities, Prince Edward Island | Autorité des marchés financiers |
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| Superintendent of Securities, Northwest Territories | Superintendent of Securities, Yukon Territory |
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| Superintendent of Securities, Nunavut | |
RE: Dominion Diamond Corporation
Pursuant to a request from the above-mentioned reporting issuer, we wish to advise you of the following information in connection with its Annual and Special Meeting of Shareholders:
| Date of meeting: | June 13, 2017 |
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| Record date for notice: | May 11, 2017 |
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| Record date for voting: | May 11, 2017 |
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| Beneficial ownership determination date: | May 11, 2017 |
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| Securities entitled to notice: | Common |
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| Securities entitled to vote: | Common |
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| Issuer mailing directly to non objecting beneficial owners: | No |
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| Issuer will pay for objecting beneficial owner material distribution: | Yes |
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| Issuer using notice-and-access for registered investors: | No |
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| Issuer using notice-and-access for non-registered investors: | No |
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| Notice-and-access stratification criteria: | No |
Yours very truly,
Vijaya Somasundharem
Associate Manager, Trust Central Services
cc: CDS & Co. (Via E-Mail)
