Kimherley Diamonds : Es])ecially Cleavage Diamonds. 
89 
been pieced together from its fragments found in the same wash, proving 
either that it had been broken in the machinery, or that the same fragments 
had come from somewhere close together in the pipe. And no doubt other 
fragments could be so pieced together if the sorters had nothing better to 
do than look for them. For another thing the finds of broken diamonds in 
the matrix have not been over many, much too few indeed to formulate 
general conclusions upon. Of the hundred or so specimens of diamond in 
the matrix which have reached the sorting office, the majority have been 
whole diamonds. More specimens could have been procured, no doubt, had 
they been sought for, especially in the hard blue ground lumps mined from 
the deeper levels of the De Beers or the Kimberley Mines ; but a diamond 
in the matrix takes some finding, and a searcher might have to turn over 
many tons of rock before setting eyes on a diamond. At any rate, twenty is 
a liberal estimate of the number of broken diamonds found in their matrices 
that have been available for investigation ; and there is no earthly reason 
why in some of these twenty cases we might not have found corresponding 
fragments of the dicimonds could we have found corresponding halves of the 
matrices. Speaking of matrices, a fine lump of kimberlite, in dimensions 
about five inches long by four thick, picked up some years ago, contained 
two well formed diamonds, one a large yellow, the other a small brown one. 
15. Yellow Diamonds. 
A word must be said about yellow diamonds. From the representative 
assortments of Pool and Dutoitspan diamonds, given near the beginning of 
this paper, we get the following comparisons : 
All stones 19-24 . 24*96 
All cleavages 38-98 . 41-71 
Eejection chips, rubbish, and bort . 41-77 . 33-21 
Thus there are twice as many cleavages as stones in the Pool, and about 
one and three-quarter times as many cleavages as stones in the Dutoitspan. 
Of these, yellow diamonds alone (including off-colours) are : 
Yellow stones 7-68 . 8-66 
Yellow cleavages 11-04 . 9-93 
and leaving out brown and " fancy " (which are largely brown) diamonds, 
which are : 
Pool. 
Per cent. 
Dutoitspan. 
Per cent. 
Pool. 
Per cent. 
Dutoitspan. 
Per cent. 
Dutoitspan. 
Per cent. 
3-01 
7-88 
