Martyr, account of emeralds, 295, 296. Mary Queen of Scots, jewels of, 193. Matura diamonds, 225. Mawe’s visit to Lisbon, 221. Mellan, or gem conglomerate, 374, 379. Minas Geraes diamond mines, 41. Mirror of Naples, diamond, 193. Missorium, or emerald table, 123. Mithridates, 130. Montezuma’s mantle, 294. Morse, H. D., diamond establishment, 247, 272. Mosaics of precious stones, 398. Murat, General, uniform of, 229. Murchison’s views, 43. Muzo, emerald mines of, 327. N. Nadir Shah, 151, 152, 186, 187, 204, 206, 211. Narbonne, pillage of, 123. Nassac diamond, 187. Navajos, turquoises of, 293. Nero’s Lens, 288. New Hampshire beryls, 314. Newera Ellia sapphire mines, 373. Newton’s views, 67, 81, 92, 99. Nizam diamond, 217. North Carolina sapphire mines, 388-390. O. Oldham, visit to the Burmah ruby mines, 402. Oliva, actress, 175. Opal, 335. ancient mines of, 341, 349. Babinet’s views of, 339. beauty of, 338. black variety of, 349. cause of its colored reflections, 339, 340. commerce of, 367. Count Waliski, 354. Damour’s experiments with, 337. dandritic, 338. Delius’ account of Hungarian opals, 350. Descloizeaux, views of, 347. described by Jackson, 355. division of, by Jameson, 338. Werner, 338. Dr. Le Conte’s, 355. engraved, 351. formation of, 346, 347. Harlequin variety, 349. Hydrophane variety, 337. imitations of, 351. mines of, 341. Central America, 343. Gracias a Dios, 343. Honduras, 342. Hungary, 341-349. Queensland, 346. Zimapan, 348. Mohr’s views of, 339. Newton’s views of, 339. of Austria, 354. Opal of D’Auguy, 354. Empress Josephine, 353. Fleury, 354. France, 354. Humboldt, 354. Nonius, 352, 353. U. S. Centennial Exhibition, 355. on image of Mexican deity, 355. physical properties of, 336, 337. purchase of, 357, 360. splendors of, 356. superstitious fancies regarding, 361-364. treatment of, when mined, 350. value of, in rough state, 360. Nonius’s gem, 361. varieties of, 338. Orb of Russia, 140. Order of the Golden Fleece, 225, 226. Origin of diamonds, 57. gems, 335. Orloff diamond, 149-152. Ottoman display of gems, 117. P. Passion for gems, etc., 280, 281. Paulina, gems of, 288. Peacock Throne, 210. Peligot’s views on ancient glass, 352. Persian emblems of authority, 287. treasures, 214-216. Peruzzi, inventor of the brilliant, 251. Peysonnel, 72. Phidias, 369. Philip of Spain, 170, 196. wedding of, 197. Pictet, 71. Piggot diamond, 187. Pitt, Wm., and Regent diamond, 164, 165. Placidia, marriage of, 123. Plato’s views on gems, 73. Pliny’s views on gems, 15, 285, 287, 288, 328, 330, 331, 368, 369, 414. Plumbago, or graphite, 16, 18. Plunder of Delhi, 204.