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u
Ultraviolet light, gem-stones under, 17. Ultraviolet rays, 18, 70; 103. Uru valley, 148, 150. Uva'rovite, 130, 132.
V Vaidooryam, 119, 120. Vajra-hirak, 66; Adamas (Greek and Latin), 'adamant', and
diamond,
66. Valiom diamond, 144, 145. Variscolite, 153. Vargas diamond, 72,
100. Verneuil process, 60-61, 63, 118. Vesuvianite, 13, 25. Vincenzo
Peruzzi, 42. Vitreous or glassy lustre, 17. ,
W Wajrakarur, 75, 84. Westphal's balance, 23, 25-26. Williams, Alpheus F., 73.
X
X-rays, 18, 53, 70, 72, 137.
Y
Ye-ban-gwet, 113.
Z
Zircon,
6, 13, 47, 57, 63, 108, 109; introduction, 136; physical properties,
137; uses, 137; gem varieties, 138; occurrence, 138-139. Zoisite, 161.
The contents of the book are the Copyright of the Author.
Published by Rao Bahadur Dr. I,. A. N. Iyer, J. N. Tata Professor of Geology,
Patna University, Patna, and Printed by Norman A. Ellis, Baptist Mission Press,
41A I<ower Circular Road, Calcutta.
188
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