Gem Resources PLC - operator of Gravelotte, an emerald mine in South Africa - Notes recent rise in share price. States there is no known reason for the increase. Its shares are currently 38% higher than five days ago and more than double their value a month ago. The firm adds there has been no material change in its financial position since it published its 2024 results at the end of April.

Current stock price: 0.35 pence each, up 4.6% on Tuesday afternoon in London

12-month change: down 76%

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