The diamonds were difficult for the prospectors to find, but why is that?\nOptions:\n- more expensive than sand\n- rare\n- pretty\n- clear\n- dessert
Reason slowly and give your answer.
rare
Rare of a thing means not found in large numbers and so of interest or value.

The diamonds were difficult for the prospectors to find, but why is that rare.

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So, the final answer is rare