Both in Kimberley and De Beers the blue ground on the west side is poorer in diamonds than the blue ground in other parts of the mines. The diamonds from the west side also differ somewhat from those in other parts of the same mine.
The diamonds from each mine have a distinctive character, and so uniform are the characteristics that an experienced buyer can tell at once the locality of any particular parcel of stones. An isolated stone may, of course, be found occasionally in any one mine which is characteristic of some other source of production, but this is the exception to the general rule.
There is a great similarity between the produce of the De Beers and Kimberley mines. A day's wash from either of these mines could be distinguished from each other, but not so easily the majority of the individual stones.
The Kimberley Mine produces a small percentage of white crystals, octahedral in 63
