Gem Diamonds shares fall 18% as revenue slumps and impairment charges push it to $104m loss

Shares in Gem Diamonds Limited (LSE:GEMD, OTC:GMDMF)) fell 18% to 3.78p on Wednesday after the company reported a $104 million attributable loss for 2025, driven by a $77.5 million writedown of the carrying value of its Letšeng mine in Lesotho. Revenue fell to $98.4 million from $154.2 million in 2025, while underlying EBITDA (earnings before interest, tax, depreciation and amortisation) collapsed to $3.9 million from $29.7 million.