Jewish settlers shifted from adventuring to trade and then diamonds

Evidence

Early Jewish settlers in South Africa in the eighteenth and the first part of the nineteenth century were adventurers; traders and merchants followed them after the middle of the century, among whom the most prominent turned to industries such as fishing, sealing, and whaling (De Pass Brothers) and ostrich breeding (the Mosenthal family). Later, they were almost forced into the Kimberley diamond industries where, however, they never achieved such pre-eminence as Barnato and Beit. — Hannah Arendt, The Origins of Totalitarianism, 2344