The company, which is focused on West Africa, is offering 6,031 carats of rough for sale in the tender which ends on March 11.
Diamond explorer Stellar, which operates in West Africa, is currently holding viewings of goods at its first tender of rough diamonds in Antwerp.
The tender of 6,031 carats of rough, which began on February 25 and ends on March 11, is of goods from areas of Sierra Leone and Guinea.
The tender is taking place at the premises of Natural Diamond Corporation at 53 Hoveniersstraat in the diamond district on the 9th floor in rooms 920-929.
Authorized buyers can apply to Natural Diamond Corporation to see the goods being offered.