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The Art of Gem Cutting: Including Cabochons, Faceting, Spheres, Tumbling ...
H. C. Dake,Henry Carl Dake
No preview available - 1987
SOME PHYSICAL PROPERTIES OF GEM STONES
THE CUTTING OF STONES ARTIFICIAL STAIN
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ACCOUNTS Africa agate Alexandrite aluminium amber amethyst ancient Aquamarine aventurine B.Sc Barrister-at-Law beads beautiful beryl blue brilliant BUSINESS cabochon calcium carats carnelian carved cat's-eye Ceylon chemical chrysoberyl cleavage cloth gilt colour colourless COMMERCIAL coral corundum crown 4to crown 8vo cultured pearl cut and polished Demantoid demy 8vo diamond dichroism DICTIONARY effect emerald facets felspar Fourth Edition garnet gem stones glass green stones hardness heat imitation India INDUSTRIAL iron jade jadeite jewellery known lapis lazuli LL.D lustre M.Com mineral mines mounted jewellery natural stones necklaces Onyx opal oxide peridot pieces PRACTICE PRECIOUS AND SEMI-PRECIOUS precious stones produced properties refractive indices rock crystal rough material rough stone rubies and sapphires sapphire Second Edition seen semi-precious stones shell Silicate sometimes South specific gravity specimens sphene spinel Spodumene superstition synthetic stones Third Edition to-day topaz tourmaline transparent turquoise vary weight whilst yellow zircon