CEO Eira Thomas said the high-white gem diamond would be shown alongside the 240ct and 127ct top white gem diamonds recovered in January, at the upcoming March 7 tender.
"2019 is off to a great start, with several, high-quality diamonds in excess of 100ct having been recovered by mid-February, a testament to the strong, stable operating environment that has prevailed at Karowe since late 2018," she said.
The company expects to mainly mine the high-value South Lobe in 2019, including contributions from the newly refined EMPKS unit, which is understood to be the source of the mine's two largest diamonds to date.
Karowe currently has openpit reserves of 2.6 million carats, with a mine plan extending out to 2026.
The company is completing a feasibility study that could expand mining underground and extend the mine's life to 2036 and beyond.