Stellar Diamonds : Payment of Tongo Environmental Licence Extension of Tribute Mining Agreement Longstop date

25 September 2017

AIM: STEL

Stellar Diamonds plc

('Stellar' or the 'Company')

Payment of Tongo Environmental Licence

Extension of Tribute Mining Agreement Longstop date

Stellar Diamonds plc, the London listed diamond development company focused on West Africa, announces that it has paid US$150,240 to the Sierra Leone Environmental Agency for the Tongo Environmental Licence. As previously stated, the Tongo Mining Licence has been approved by the Minerals Advisory Board subject to the issuing of the Environmental Licence. Once the Environmental Licence has been issued the National Minerals Agency will draw up the Tongo Mining Licence for consideration and signature by the Minister of Mines and Minerals Resources.

Furthermore, the Company has agreed with Octea Mining to extend the longstop date (for the satisfaction of certain of the conditions precedent of the binding Tribute Mining and Revenue Agreements ( 'Agreements') in relation to the Tongo-Tonguma mine development project in Sierra Leone, as defined in the announcement dated 28 April 2017) to 31 October 2017.

Chief Executive Karl Smithson commented:

'The payment of the environmental licence fee is an important step to Stellar being issued the large scale mining licence for the Tongo project. The adjacent Tonguma project already has a 25 year mine licence issued in 2012. The combined Tongo-Tonguma project covers a series of high-grade and high-value kimberlites, three of which host a 4.5 million carat resource that comprises the 21 year life of mine plan. The longstop date of the Agreements has been extended as we continue to progress potential project funding and complete other certain conditions precedent to the Agreements. We look forward to providing a further update as we progress.'

For further information contact the following or visit the Company's website atwww.stellar-diamonds.com.

About Stellar Diamonds plc

Stellar is an AIM listed (AIM: STEL) diamond development company focused on the 4.5 million carat high-grade and high value Tongo-Tonguma kimberlite diamond project in the world famous diamond fields of eastern Sierra Leone. An independently generated mine plan, based on over 66,000m of drilling that has been completed to date, envisages the production of over 4 million carats, generating gross revenues of more than US$1.2 billion, over a 21 year life of mine. Initial production at Tongo-Tonguma is scheduled to occur in the first year of development, building up to over 200,000 carats per annum, with a weighted average modelled diamond value of $229 per carat. The Tongo-Tonguma mine is estimated to give Stellar an attributable a Post-tax NPV(8) of US$109 million and IRR of 30%.

This announcement contains inside information for the purposes of Article 7 of EU Regulation 596/2014.

Caution regarding forward looking statements

Certain statements in this announcement, are, or may be deemed to be, forward looking statements. Forward looking statements are identified by their use of terms and phrases such as 'believe', 'could', 'should' 'envisage', 'estimate', 'intend', 'may', 'plan', 'potentially', 'will' or the negative of those, variations or comparable expressions, including references to assumptions. These forward looking statements are not based on historical facts but rather on the Directors' current expectations and assumptions regarding the Company's future growth, results of operations, performance, future capital and other expenditures (including the amount, nature and sources of funding thereof), competitive advantages, business prospects and opportunities. In particular, there is no guarantee that the Company will be able to complete the Tribute Mining Agreement. Such forward looking statements reflect the Directors' current beliefs and assumptions and are based on information currently available to the Directors.

A number of factors could cause actual results to differ materially from the results discussed in the forward looking statements including risks associated with vulnerability to general economic and business conditions, competition, environmental and other regulatory changes, actions by governmental authorities, the availability of capital markets, reliance on key personnel, uninsured and underinsured losses and other factors, many of which are beyond the control of the Company. Although any forward looking statements contained in this announcement are based upon what the Directors believe to be reasonable assumptions, the Company cannot assure investors that actual results will be consistent with such forward looking statements. Accordingly, readers are cautioned not to place undue reliance on forward looking statements. Subject to any continuing obligations under applicable law or any relevant AIM Rule requirements, in providing this information the Company does not undertake any obligation to publicly update or revise any of the forward looking statements or to advise of any change in events, conditions or circumstances on which any such statement is based.

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