Hey there Adam,
I would also hope for a scientifically definitive answer to this question. As to the quantity of nanodiamonds in the carbonaceous chondrites, a search of my site yielded some data for this. Sources give the abundance in both Colony and Murchison as 1,000 ppm, which is 1 part in a thousand. This doesn't seem to be very high to me but perhaps this clumping property is the ultimate answer.
I didn't find this quantity data for any ureilites, but interestingly, Indarch EH4 contains ~17 ppm of microdiamonds, 1,000 times larger than nanodiamonds.
Perhaps Bernd could check his extensive resources for more info.
David
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