How common are diamondiferous kimberlites or lamproites?

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Multiple Choice

How common are diamondiferous kimberlites or lamproites?

Explanation:
Diamonds are not present in every kimberlite or lamproite; only a small subset carries diamonds in economically viable quantities. There are many kimberlites known worldwide, but the proportion that are diamondiferous is relatively small, and diamond-bearing lamproites are even rarer. This rarity reflects the specific conditions needed for diamond formation and preservation and for those diamonds to accumulate in a pipe with a workable grade and size. So, the best answer is that diamondiferous kimberlites or lamproites are very few.

Diamonds are not present in every kimberlite or lamproite; only a small subset carries diamonds in economically viable quantities. There are many kimberlites known worldwide, but the proportion that are diamondiferous is relatively small, and diamond-bearing lamproites are even rarer. This rarity reflects the specific conditions needed for diamond formation and preservation and for those diamonds to accumulate in a pipe with a workable grade and size. So, the best answer is that diamondiferous kimberlites or lamproites are very few.

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