Cornes, a Japanese conglomerate that manufactures everything from luxury cars to kitchenware to diamond reactors, completed the acquisition of minority stakes in Green Rocks, a company that wholesales lab-grown diamonds to retailers, and Isrough, a Israel diamond grower, from Ofer Mizrahi Diamonds, a natural diamond company. Financial terms were not disclosed. "The investment will enable Isrough to quintuple its current production of diamonds grown by chemical vapor deposition by next year," Leon Peres, Green Rocks CEO.