Diamond miners Gem Diamonds delivered solid operational results for the year ended December 31, which, together with the targeted gains of a business transformation programme and continued emphasis on cost controls, affirmed it as one of the lowest-cost producers in the industry, CEO Clifford Elphick said on Wednesday. The operational results were characterised by the achievement of all guided operational metrics and the recovery of 11 diamonds greater than 100 ct each, which also brought the total number of diamonds of greater than 100 ct recovered at the Letšeng mine, in Lesotho to 100.