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| | South Africa diamond deposits, geology, exploration, mining, use - Part III |
 | | The bed of the Vaal is strewn with blocks of basalt, often amygdaloidal in character, and with other rocks, which are probably of metamorphic origin. |
 | | The search for diamonds was at first confined to the bed of the river, but it was soon discovered that the sands and gravels of the river-terraces were as rich or richer than the riverbed, so that these also came to be worked. |
 | | A few specially large stones have been secured in the river diggings, such, for example, as the "Star of South Africa," a diamond of the purest water, weighing, in its rough condition, 83 1/2; carats; also the slightly yellow "Stewart", weighing 288 3/8 carats, which was found at Waldeck's Plant on the Vaal River. |
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