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SMALL-CAP WINNERS & LOSERS: Gem Diamonds lowers outlook on weak prices

ALN

The following stocks are the leading risers and fallers among London Main Market small-caps on Wednesday.

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SMALL-CAP - WINNERS

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Caledonia Mining Corp PLC, up 7.8% at 1,756.50 pence, 12-month range 731.00p-1,800.00p. The Zimbabwe-focused gold miner expects to post profit ‘materially ahead’ of market consensus for 2025, based on the current production profile at the Blanket mine and assuming the continuation of ‘favourable’ gold prices. The firm anticipates reporting a profitable second quarter, ‘building upon a strong performance’ in its first quarter. ‘We were pleased with the excellent production results announced on July 16, 2025. Combined with a robust and sustained gold price, we are enjoying strong profitability. This reflects the hard work and dedication of the team at Blanket Mine and at group level, which we have strengthened significantly in recent times,’ says Chief Executive Officer Mark Learmonth. Interim results will be released on August 11.

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Porvair PLC, up 4.2% at 748.00p, 12-month range 602.00p-864.00p. GGG Spa has a 25.17% stake in Norfolk, England-based environmental and specialist filtration technology firm as of Monday, up from none reported.

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SMALL-CAP - LOSERS

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Gem Diamonds Ltd, down 14% at 5.18p, 12-month range 4.60p-15.70p. The diamond miner in Lesotho and Botswana reports revenue of $44.7 million for the six months that ended June 30, declining 43% from 77.9 million. Carats sold fell 22% to 44,360 from 56,944 and the average price per carat slips 26% to $1,008 from $1,366. As a result, Gem Diamonds lowers its full-year guidance for 2025. It now forecasts carat sales of 84,000 to 87,000 against its prior 86,000 to 89,000 guidance. Waste tonnes mined is revised down to between 1.8 million and 2.0 million tonnes from 5.0 million to 5.5 million tonnes. Guidance for ore treated remains unchanged at 4.9 million to 5.1 million tonnes, and carats recovered remains at 87,000 to 90,000. ‘Considering the prolonged weakness in global diamond prices, compounded by a weak US dollar and ongoing US tariff uncertainties, Gem Diamonds has implemented decisive measures to conserve cash and protect shareholder value. While the company has met its production targets, it has not been immune to the sustained pressure on rough diamond prices and adverse exchange rate movements,’ Gem Diamonds explains.

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