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. |
From inside the book
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Page 58
... color illustrating the range of GIA diamond grades D - Z . 58 GIA - GTL colorless scale legally cannot be termed a. Color in diamond Diamond is a special case ! Diamond is colorless so there is no need to discuss either hue saturation .
... color illustrating the range of GIA diamond grades D - Z . 58 GIA - GTL colorless scale legally cannot be termed a. Color in diamond Diamond is a special case ! Diamond is colorless so there is no need to discuss either hue saturation .
Page 61
... grade of SI1 viewed under magnification . ( top ) : Invisible to the eye , grade - making inclusions are barely visible under 10X magnification ... colors of diamond to receive one of GIA. Connoisseurship in natural fancy color diamonds /
... grade of SI1 viewed under magnification . ( top ) : Invisible to the eye , grade - making inclusions are barely visible under 10X magnification ... colors of diamond to receive one of GIA. Connoisseurship in natural fancy color diamonds /
Page 62
... grade as the Hope Diamond ) . 62 level will show very little color face up yellow is by far the most common , a ... Color Grading , " p . 237 , states : " Because 63 64. certain rare colors of diamond to receive one of GIA - GTL's coveted ...
... grade as the Hope Diamond ) . 62 level will show very little color face up yellow is by far the most common , a ... Color Grading , " p . 237 , states : " Because 63 64. certain rare colors of diamond to receive one of GIA - GTL's coveted ...
Contents
PART II | 10 |
The Geometry of beauty | 22 |
Secrets of the trade | 37 |
Copyright | |
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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