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alexandrite almandine aluminum amethyst Andradite garnet angle aquamarine artificial beryl blue brilliant cabochon cut called carat cat's-eye Ceylon chrysoberyl chrysolite citrine quartz colored stones colorless corundum gems crystal cut stone dealer defects demantoid demantoid garnet diamond dichroism dichroscope dispersion distinguish double doublet doubly refracting edges emerald facets frequently furnishes G. F. Herbert-Smith gem material gem minerals girdle glass imitations grain green stones hardness hence hessonite jade jadeite jewelers kunzite lapidary lapis layers lens less LESSON light luster metallic metric carat mineral species moonstone natural nephrite olivine opal Oriental oxide pale pearls peridot pink polished precious stones properties pyrope quartz gems red stones refractive index ring ruby spinel sapphire scientific ruby scientific stones scratch seen shade shape silicates singly refracting softer sometimes specific gravity specimens spinel surface tint tourmaline trade true topaz usually variety weight white sapphire yellow yellowish zircon
Page 295 - Diamonds and other precious stones, rough or uncut, and not advanced in condition or value from their natural state by cleaving, splitting, cutting, or other process...
Page 296 - ... 20 per centum ad valorem; diamonds, coral, rubies, cameos, and other precious stones and semiprecious stones, cut but not set, and suitable for use in the manufacture of jewelry, 20 per centum ad valorem ; imitation precious stones, cut or faceted, imitation semiprecious stones, faceted...
Page 296 - ... imitation precious stones, including pearls and parts thereof, for use in the manufacture of jewelry, doublets, artificial, or so-called synthetic or reconstructed pearls and parts thereof, rubies, or other precious stones, twenty per centum ad valorem.
Page 32 - Institute,1 is to weigh the sample in air and then in water as quickly as possible, and divide the weight in air by the loss of weight in water.
Page 146 - more like a mediaeval doctor's prescription than the making of a respectable mineral.
Page 319 - ... and they are good and of great virtue, and they are all square and pointed of their own nature ; and some are six-square, some four-square, and some three, as nature shapes them; and, therefore, when great lords and knights go to seek honour in arms, they gladly bear the diamond upon them.
Page 181 - Consular reports occasionally mention the finding of a few scattered crystals but the rich deposits were apparently worked out during the seventeenth century and the early part of the eighteenth century.
Page 305 - By Dr. MAX BAUER, Privy Councillor, Professor in the University of Marburg. Translated from the German, with Additions, by LJ SPENCER, MA (Cantab.), FGS, Assistant in the Mineral Department of the British Museum. JUST OUT. In Large 8vo. Handsome Cloth. FIFTEENTH EDITION. Thoroughly Revised, Enlarged, and Re-cast, аи.