Polariscope, 261. Poles, customs of, 134. Polycrates, ring of, 116, 288. Pompadour’s jewels, 174. Pompey, 130. ring of, 290. Pope Julius II., beryl of, 319. Potemkin, gems of, 154. Potemkin’s plume, 145. Priest’s treasury in the Kremlin, 141. Prince Esterhazy jewels, 212, 229. Prismatic display of the diamond, 92, 93, 96-98. Q. Queen Caroline, jewels of, 196. Elizabeth, jewels of, 197. Mary, jewels of, 196. R. Raleigh, Walter, dress of, 198. Ralph Potter, lapidary, 243. Rambusson’s remarks on ruby mines, 403. Ramusso, Venetian historian, 130. Ranee Ruthen’s diamond, 218. Ratnapoora, sapphire mines of, 372, 374. Ravenna, capture of, 125. Refractive power of gems, 259-262. Regale of France, gem, 199. Regalia of Charlemagne, 226. England, 179. France, 158. Russia, 132. Regent diamond, 161, 165. Richelieu’s wreath, 160. Ring of Ahmed, 116. Polycrates, 116. Rohan, Cardinal de, 174. Rome, triumphs of, 119. Romè de L’Isle, description of diamond, 222. Rose-colored diamonds, 228. Rose diamonds, Antwerp form, 244, 251. Holland form, 244, 251. Round brilliant, 222. Royalston, locality of beryls, 311-313, 315. Ruby, lustre of the potters of Umbria, 325. of Crown of Persia, 407. Crown of Russia, 407. East India Company, 407. King of Burmah, 406. Prince of Wales, 180, 406. price of, 427. seen by Garcia, 407. Runjeet Singh gems, 206-208. S. Sacred standard of Persia, 23. vestments, 127. Sacro catino--emerald dish, 323. Saffragan sapphire mines, 374. Sancy diamonds, 166-171. Sapphire, 365. black variety, 417. carved by the Hindoos, 397. colors of, 394, 398, 411-420. composition and characters of, 387, 400. deposition of, 377-384, 389. engraved, 405, 412, 417-424. formation of, in Ceylon, 384, 385. imitations of, natural and artificial, 424, 425. Sapphire, mines of, 372, 378, 379, 388-390. Ava, 401. Bengal, 393. Bohemia, 393. Burmah, 400-403. Ceylon, 400-403. China, 408. Colorado, 392. Montana, 390, 391. North Carolina, 388, 411. Siam, 403. red, known as Oriental ruby, 398-400, 403-408, 424, 426. refraction of, 98. roof of the Parthian Palace, 397. varieties, early known, 367. Sapphires of the French Crown, 395, 397, 399, 411, 412. Hungarian Crown, 396. King of Ava, 402. Miss Coutts, 396, 398. the Russian casket, 397. price of, 425-427. Sapphirus, 368. Sarmatia, ancient, 133. Sassanian kings, 23, 25. Saxon white brilliant, 223. Saxony, Elector of, gems, 224. Sceptre of Vladimir, 138. School of Mines, St. Petersburg, 145. Scythian incursions, 133. Selwyn’s views of gold deposits, 77. Serena, 121. Shah Jehan, 202, 209, 210, 218. Nasiru’d-din of Persia, 216. Soujah, 207.