South Africa 南非

选择正确。南非是世界最大钻石出口国。South Africa is the world's biggest exporter of raw diamonds.

不对。Ruby（红宝石） is not found in South Africa.

不对。蓝宝石（Sapphire） is not found in South Africa.

不对。Emerald（绿宝石） is not found in South Africa.

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