Cymophane, 120 Cyprine, 160.
D Danburite, 61, 108. Dariya-i-noor, 98. De Beer's mine, 82, 83, 88, 89. Dementoid, 132. Density, 20, 22. ,
Diamond, 3, 4, 11, 12, 17, 18, 19, 21, 22, 31, 33, 42, 45, 57, 58, 136. Diamonds, classification of, 85-86.
Diamond—cutting, 45; centres, 45; inspection, 50; cleaving, 50; sawing, 51; cutting, 51-52; polishing, 52; processes, 50. „ cutting industry—technology, 49-55;—post-war, 48-49.
„ genesis, 72-74.
Diamond—inclusions in, 69; introduction; 66-67.
„
—industry in 1946, 90. , . Diamond deposits of India, 2. Diamond pipes
of S. Africa, 6. Diamonds, distribution in India, Burma and Ceylon,
74-80; of
India, 9. Diamonds—famous Indian, 95-97. Diamond fields in other continents—Brazil, 47, 67, 81; Africa, 67,
72, 81-83. Diamonds—flaws in, 87.
—grading according to colour, 87-88. —Indian reserves and outlook, 94-95. „ mines of, Central India, 81; India, 46.
' „ mining in Central India, 84-85.
„ „ South Africa, 10.
„ occurrence in Central India Agency, 78-80.
„ „ Mahanadi valley, 77-78.
„ „ South India, 74-77.
„ optical properties of, 69; physical properties, 67-72;
preparation,
mining, etc., 80-83; production, 92-93, size of, 71-72; specification
and valuation, 85-90; treatment of ore, 83-84; uses and industrial
utilization; 90-92. Dichroism, 39, 63. Dichroscope, 29, 39, 40.
Diggings, dry, 72, 81; river, 80. Diopside, 156. Dispersion, 31.
Doublets and false, 64.
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