Lucara Share Capital and Voting Rights Update

(LUC - TSX, LUC - BSE, LUC - Nasdaq Stockholm) Lucara Diamond Corp. ("Lucara" or the "Company") reports the following in accordance with the Swedish Financial Instruments Trading Act:

As a result of the vesting of employee share units from May 1, 2018 to date, the number of issued and outstanding shares of the Company has increased to 396,309,387 common shares with voting rights as at May 31, 2018.

The total number of voting rights in the Company is therefore 396,309,387. This figure may be used by shareholders as the denominator for the calculation by which they will determine if they are required to notify their interest in, or a change in their interest in, the Company under the Swedish Financial Instruments Trading Act on disclosure of major shareholdings (Transparency Rules).

Eira ThomasPresident and Chief Executive Officer

Lucara Diamond on Facebook: https://www.facebook.com/LucaraDiamond/Lucara Diamond on Twitter: https://twitter.com/LucaraDiamondLucara Diamond on LinkedIn: https://www.linkedin.com/company/lucara-diamond-corp-Lucara Diamond on Google+: https://plus.google.com/+LucaradiamondCorporationLucara Diamond on Instagram: https://www.instagram.com/lucaradiamond/

About Lucara

Lucara is a leading independent producer of large exceptional quality Type IIa diamonds from its 100% owned Karowe Mine in Botswana. The Company has an experienced board and management team with extensive diamond development and operations expertise. The Company operates transparently and in accordance with international best practices in the areas of sustainability, health and safety, environment and community relations.

About Clara

Clara Diamond Solutions (Clara), wholly owned by Lucara Diamond Corp, is a secure, digital sales platform that uses proprietary analytics together with cloud and blockchain technologies to modernize the existing diamond supply chain, driving efficiencies, unlocking value and ensuring diamond provenance from mine to finger.

The information in this release is accurate at the time of distribution but may be superseded or qualified by subsequent news releases.

The Company is obliged to make this information public pursuant to the Swedish Financial Instruments Trading Act. This information was submitted for publication on May 31, 2018 at 2:45 p.m. Pacific Time through the contact persons set out above.

Investor and Public Relations, +1 (604) 689-7842, info@lucaradiamond.com; Sweden: Robert Eriksson, Investor Relations, +46 701-112615, reriksson@rive6.ch; UK: Louise Mason, Citigate Dewe Rogerson, +44 (0)20 7282 2932 Louise.Mason@Citigatedr.co.uk

SOURCE Lucara Diamond Corp.

View original content: http://www.newswire.ca/en/releases/archive/May2018/31/c7222.html

SOURCE: Lucara Diamond Corp.

Investor and Public Relations, +1 (604) 689-7842, info@lucaradiamond.com; Sweden:
Robert Eriksson, Investor Relations, +46 701-112615, reriksson@rive6.ch; UK: Louise
Mason, Citigate Dewe Rogerson, +44 (0)20 7282 2932 Louise.Mason@Citigatedr.co.uk