LIST OF PLATES

The Cullinan Diamond, from a photograph by the Author (see pp. 76–79)Frontispiece

FIG.FACING PAGE

1. River Washings at Klipdam10

2. Plan of the Kimberley Diamond Mines10

3. Kimberley Mine. The “Pipe”18

4. Section of Kimberley Mine18

5. Wesselton Diamond Mine. Open Workings34

6. De Beers Compound40

7. De Beers Mine. Underground Workings40

8. De Beers Washing and Concentrating Machinery48

9. Sorting Concentrates for Diamonds. De Beers54

10. De Beers Diamond Office. 25,000 carats72

11. De Beers Diamond Office. The Valuators’ Table72

12. A group of large Diamond Crystals76

13. Some Historic Diamonds80

14. Crystalline forms of native Diamonds86

15. Triangular Markings on natural face of a Diamond Crystal88

16. Triangular Markings artificially produced on a Diamond Crystal88

17. Diamond-cut Glass and Shavings98

18. Diamonds in Röntgen Rays. A. Black Diamond in gold frame. B. Pink Delhi Diamond. C. Paste Imitation of B.98

19. Curve of Vapour Pressure of Carbonpage 113

20. Moissan’s Electric Furnace116

21. Artificial Diamond made by the Author from molten iron120

22. Moissan’s Artificial Diamonds120

23. Diamonds from Canyon Diablo Meteorite138

DIAMONDS