Secrets of the Gem Trade: The Connoisseur's Guide to Precious GemstonesAs the sub-title suggests, this is the consumer's guide to precious gemstones. Divided into two parts: In plain non-technical language, Part I redefines preciousness and gently guides the reader toward a real understanding of those criteria that make a gemstone. Part II contains a series of individual essays that apply the criteria of connoisseurship to 35 of today's most important gemstones. The book covers precious stones old and new including diamond, pearl, tourmaline, sapphire, chalcedony, spinel, ruby, and garnet. |
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Page 205
The Connoisseur's Guide to Precious Gemstones Richard W. Wise. Chapter 28 Green Tourmaline Green tourmaline is the most widely distributed of the precious varieties of this mineral and consequently is lower in price . It is rarely ...
The Connoisseur's Guide to Precious Gemstones Richard W. Wise. Chapter 28 Green Tourmaline Green tourmaline is the most widely distributed of the precious varieties of this mineral and consequently is lower in price . It is rarely ...
Page 206
... green gemstone and can be compared , at least superficially , to emerald . Green hue achieves its maximum saturation at about seventy- five percent tone . So , as with ... green tourmaline never exhibits the glow 206 . GREEN TOURMALINE.
... green gemstone and can be compared , at least superficially , to emerald . Green hue achieves its maximum saturation at about seventy- five percent tone . So , as with ... green tourmaline never exhibits the glow 206 . GREEN TOURMALINE.
Page 266
... tourmaline , 201 Govenador Valadares ( Minas Gerais , Brazil ) , tourmaline from , 199 , 211 grading clarity in diamond , 60-61 colorless diamond , 10 , 56-57 , 58-59 , 240 , 243 ColorScan system , 10 fancy color diamonds , 227 green ...
... tourmaline , 201 Govenador Valadares ( Minas Gerais , Brazil ) , tourmaline from , 199 , 211 grading clarity in diamond , 60-61 colorless diamond , 10 , 56-57 , 58-59 , 240 , 243 ColorScan system , 10 fancy color diamonds , 227 green ...
Contents
PART II | 10 |
The Geometry of beauty | 22 |
Secrets of the trade | 37 |
Copyright | |
43 other sections not shown
Other editions - View all
Secrets of the Gem Trade: The Connoisseur's Guide to Precious Gemstones Richard W. Wise No preview available - 2016 |
Secrets of the Gem Trade: The Connoisseur's Guide to Precious Gemstones Richard W. Wise No preview available - 2006 |
Common terms and phrases
aficionado agate alexandrite amethyst appear aquamarine beauty blue diamonds blue sapphire bluish body color Brazilian brilliance brown brownish Burma cabochon carat carnelian cat's-eye chalcedony chrysocolla chrysoprase clarity grade collector color grade colored gemstones colored stones colorless diamonds connoisseur connoisseurship courtesy crystal cultured pearls dark daylight dealers described diamond color diamond grading eighty percent emerald evaluation exhibit face-up faceted fancy color diamonds finest fluorescent freshwater pearls garnet gem varieties Gemological Gemological Institute gemologist Gems & Gemology gemstones GIA-GTL grading reports incandescent light Jeff Scovil key color lapidary lapis lighting environment luster multicolor effect nacre normally opal orange padparadscha Paraiba parcel percent tone pinkish precious primary hue purple purplish rare refractive refractive index saturation and tone saturation modifier secondary hue South Sea pearls specific spessartite spinel Stephen Hofer tanzanite term tonal topaz tourmaline translucent transparency tsavorite visible inclusions visually pure vivid yellow yellowish