Exhibit 99.1

News release via Canada NewsWire, Toronto 416-863-9350

            Attention Business Editors:
            Mountain Province Diamonds Arranges C$11.5M Non-brokered Private
            Placement

            /NOT FOR DISSEMINATION IN THE UNITED STATES OR OVER UNITED STATES
NEWSWIRES/

            Shares Issued and Outstanding: 66,631,746
            TSX: MPV
            NY- AMEX: MDM

            TORONTO, April 27 /CNW/ - Mountain Province Diamonds Inc. ("Mountain
Province", the "Company") (TSX: MPV, NYSE AMEX: MDM) today announced that the
Company has arranged a non-brokered private placement of up to 5,476,191
million common shares ("Shares") at a price of C$2.10 per Share. If fully
subscribed, the private placement will raise proceeds of C$11.5M. Final
closing is expected on or before May 14, 2010. Proceeds from the private
placement will be used to support the feasibility study and permitting for the
Gahcho Kue diamond project, and for general corporate purposes.
            The securities described herein have not been, and will not be,
registered under the United States Securities Act of 1933, as amended (the
"U.S. Securities Act"), or any state securities laws, and accordingly, may not
be offered or sold within the United States except in compliance with the
registration requirements of the U.S. Securities Act and applicable state
securities requirements or pursuant to exemptions therefrom. This press
release does not constitute an offer to sell or a solicitation of an offer to
buy any of the Company's securities in the United States.

                                    ****

            Located in Canada's Northwest Territories, Gahcho Kue is one of the
largest high-grade new diamond projects under development globally. The
project consists of a cluster of kimberlites, three of which have an indicated
resource of approximately 30.2 million tonnes grading at 1.67 carats per tonne
(approximately 50.5 million carats) and an inferred resource of approximately
6 million tonnes grading at 1.73 carats per tonne (approximately 10.3 million
carats). Mineral resources that are not mineral reserves do not have
demonstrated economic viability.

            Qualified Person

            This news release has been prepared under the supervision of Carl G.
Verley, P.Geo., who serves as the qualified person under National Instrument
43-101.

            Forward-Looking Statements

            This news release may contain forward-looking statements, within the
meaning of the "safe-harbor" provision of the Private Securities Litigation
Reform Act of 1995, regarding the Company's business or financial condition.
Actual results could differ materially from those described in this news
release as a result of numerous factors, some of which are outside the control
of the Company.

            %CIK: 0001004530

            /For further information: Mountain Province Diamonds Inc., Patrick Evans,
President and CEO, Tel: (416) 670-5114, 401 Bay Street, Suite 2700, Toronto,
Ontario, M5H 2Y4, Phone: (416) 361-3562, Fax: (416) 603-8565,
www.mountainprovince.com, E-mail: info(at)mountainprovince.com/
            (MPV. MDM MDM)

CO:  Mountain Province Diamonds Inc.

CNW 10:41e 28-APR-10