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A Book Of Precious Stones
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Author : Julius Wodiska
language : en
Publisher:
Release Date : 1918
A Book Of Precious Stones written by Julius Wodiska and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1918 with Precious stones categories.
The Story Of The Gems
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Author : Herbert Percy Whitlock
language : en
Publisher:
Release Date : 1936
The Story Of The Gems written by Herbert Percy Whitlock and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1936 with Gems categories.
The antique use of gems -- The art of the lapidary -- The forms in which gems are cut -- The diamond -- Precious stones other than diamonds -- The semiprecious stones -- Semiprecious stones (continued) -- Chrysoberyl and opal -- The quartz gems -- The quartz gems (continued) -- The opaque gems and ornamental stones -- Unusual gem stones -- Organic products used as gems.
Gems And Jewelry
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Author : Joel E. Arem
language : en
Publisher:
Release Date : 1975
Gems And Jewelry written by Joel E. Arem and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Gems categories.
How Gems Are Formed
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Author : Jill Keppeler
language : en
Publisher: Gareth Stevens Publishing LLLP
Release Date : 2016-07-15
How Gems Are Formed written by Jill Keppeler and has been published by Gareth Stevens Publishing LLLP this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-07-15 with Juvenile Nonfiction categories.
Theyre sparkly with varied hues. You might see them in a beautiful necklace, a breathtaking ring, or even in a computer. Theyre gems! Gems are some of Earths most precious resources, and some of them are millionsor even billionsof years in the making. This detailed text, accompanied by colorful photographs, informs readers about the remarkable processes that take place under the surface of Earth to form different kinds of gems. Theyll also learn how some gems are mined, while others are replicated in laboratories. Future lapidaries will also find out how they might find and polish gems for themselves.
Gems And Gem Materials
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Author : Edward Henry Kraus
language : en
Publisher:
Release Date : 1953
Gems And Gem Materials written by Edward Henry Kraus and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1953 with Mineralogy categories.
Gems In The Early Modern World
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Author : Michael Bycroft
language : en
Publisher: Palgrave Macmillan
Release Date : 2018-12-06
Gems In The Early Modern World written by Michael Bycroft and has been published by Palgrave Macmillan this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-12-06 with History categories.
This edited collection is an interdisciplinary study of gems in the early modern world. It examines the relations between the art, science, and technology of gems, and it does so against the backdrop of an expanding global trade in gems. The eleven chapters are organised into three parts. The first part sets the scene by describing how gems moved around the early modern world, how they were set in motion, and how they were pulled together in the course of their travels. The second part is about value. It asks why people valued gems, how they determined the value of a given gem, and how the value of a gem was connected to its perceived place of origin. The third part deals with the skills involved in cutting, polishing, and mounting gems, and how these skills were transmitted and articulated by artisans. The common themes of all these chapters are materials, knowledge and global trade. The contributors to this volume focus on the material properties of gems such as their weight and hardness, on the knowledge involved in exchanging them and valuing them, and on the cultural consequences of the expanding trade in gems in Eurasia and the Americas.
Gems And Gem Minerals
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Author : Oliver Cummings Farrington
language : en
Publisher: Theclassics.Us
Release Date : 2013-09
Gems And Gem Minerals written by Oliver Cummings Farrington and has been published by Theclassics.Us this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09 with categories.
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...the high refractive power and hence play of colors of the latter. The stones are sometimes called "Matura diamonds," because of their abundance at Matura in the island of Ceylon. The colorless, or smoky zircons, are often known as "jargons" or "jargoons," a name said to have been given in allusion to the fact that though they resembled the diamond in luster they had really much less value. Besides zircons of this sort there are those known in jewelry as "hyacinth" or "jacinth," which are transparent zircons of a brownish, red-orange color. A stone of a nearly similar color is furnished by the essonite variety of garnet, and this is also often known as hyacinth. The high specific gravity of zircon above referred to is more than four times the weight of water, determinations giving results varying between 4.2 and 4.86. Zircon is thus the heaviest of gems, and will sink at once in any of the ordinary heavy liquids. The hardness of zircon is between that of quartz and topaz, being 7 . Its index of refraction is high, being 1.92, or near to the diamond among gems, a fact which accounts for its brilliancy when cut. Before the blowpipe zircon is infusible. It is not acted upon by acids except in fine powder by sulphuric acid. In composition it is a silicate of zirconium, the percentages being silica 32.8, zirconia 67.2. It usually also contains a little iron oxide. It is not an uncommon mineral in rocks, occurring in crystals of microscopic size, and in crystalline rocks it sometimes occurs in large and abundant crystals. These are usually opaque and of no value for gem purposes, although they are mined to some extent at the present time for use in incandescent lights. Opaque zircon is found...
Ceylon Island Of Gems
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Author : Elie L. Ménasché
language : en
Publisher: Asian Educational Services
Release Date : 2004
Ceylon Island Of Gems written by Elie L. Ménasché and has been published by Asian Educational Services this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Gems categories.
A Compre Hensive Look At The Precious Gems Of Sri Lanka. A Classic.
Dictionary Of Gems And Gemology
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Author : Mohsen Manutchehr-Danai
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
Dictionary Of Gems And Gemology written by Mohsen Manutchehr-Danai and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Science categories.
The rapid growth of gemological sciences and mineralogy demands a dictionary such as this for gemologists, mineralogists, geologists, jewel dealers, industry and hobbyists. With some 16,000 comprehensive definitions, supplemented by more than 250 diagrams and figures, this is a one-stop reference to any matter dealing with gems and gemology.
Dictionary Of Gems And Gemology
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Author : Robert Morrill Shipley
language : en
Publisher:
Release Date : 1974
Dictionary Of Gems And Gemology written by Robert Morrill Shipley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Nature categories.