Kimherley Diamonds : Especially Cleavage Diamonds. 71 
FF. Cleavages. See F. 
GGr, HH, II. Rejection Chips, Rubbish, and Bort. The remarks under 
Gr, H, I, apply in general in these cases also. 
It is to be noted that these assortments are on a strictly commercial 
basis. They have the market in view, and the market only, therefore 
they cannot fully answer all the questions that science would put ; but they 
give useful testimony as to the outstanding points of difference between 
the parcels of diamonds from various sources. E-oughly speaking, one system 
of sorting does for both Wesselton and Bultfontein, and another system for 
both Pool and Dutoitspan. All the same, that is not to say that for any 
assigned class, common to the two mines, the diamonds belonging to that 
class from one mine are the counterparts of those from the other. The 
Bultfontein cape stone, e. g. is not quite the same as the Wesselton cape. 
A Dutoitspan yellow has a somewhat different glow from a De Beers 
yellow. Bultfontein browns are sorted in with the fancies. Both they and 
the Wesselton browns are less full in colour than Pool browns ; indeed 
they are smoky rather than brown. Still more diverse are Wesselton 
whites and Dutoitspan whites. Again, the Bultfontein yield sorts into more 
classes than does the Wesselton yield, there being small classes of coloured 
diamonds in the former which are not represented at all in the latter, 
which is curious, seeing that a Bultfontein parcel has quite as white a 
tone as a Wesselton one. As it happens, many of the yellow diamonds, 
and particularly the larger ones, found in Bultfontein are what is called 
Dutoitspan yellows ; that is, they have the Dutoitspan and not Bultfontein 
characteristics ; and this fact, coupled with the occasional find of a diamond 
with Bultfontein characteristics at Dutoitspan, is thought to indicate some 
deep underground connection between the two mines (Hatch & Corstorphine, 
G-eology of Soutii Africa,' second edition, p. 276, 1909; Wagner, p. 151). 
The superior quality of the Dutoitspan yield over that of the Pool is well 
shown by the greater percentage of Dutoitspan diamonds in the upper 
classes. An excellent brief general account of the characteristics of the 
diamonds from the several mines will be found in Hatch & Corstorphine, 
p. 275, made up from notes supplied by A. Brink. 
As to the denominations, it should be explained that " black " is not 
black in the sense in which lady novelists use the term when they 
rhapsodise over their heroine's priceless black diamonds. It simply means 
diamonds in which black spots are abundant. In Kimberley colloquial 
speech a black diamond is generally bort when it is not coal. 
2. Comparative Statistics of Large Diamonds. 
One of the most noticeable points of difference between the diamonds 
produced from this or that mine in the Kimberley group is in the matter 
