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| A DAY IN A CEYLON GEM FIELD Delaware' Josoru L. GrlrsoN, Wilmi'ngton, In March, 1932, having two free...arrangementsto quickly visit Ratnapura, 55 miles southeast of Colombo, the center of the gem-washing injourney in...to show me the promised who found was guide a Ratnapura, and in operation durstill were that places) (washing...idamas daYs. these depression ing-ttrat the -eylo.t gem fields have been known for a very long time is indicated...plagiarizes the tale in a more interesting manner'"1 Ratnapura (a Singhalese word meaning "City of Gems") is |
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| extensive native plantations in the Northern Province, especially in the Jaffna Peninsula and the outlying...and December, the rainy season of the Northern Province. Sugar or “jaggery ” is prepared from sweet toddy...stone inthe Western Province, or of tamarind wood in the North-Central Province; in this a heavy pesile...to one family of ivory workers in the Kegalla District. The little figures of the last King of Kandy...Chief Priest are said to be contemporary portraits. Sri Wikrama Raja Sinha was the last king of the Suluwansa |
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| to prepare a new edition of the Guide. Many new gem species have been added to the collections in recent...wherever possible. In a developing world the names of gem-producing countries may change rapidly, but many...in brackets) arc shown in the following list: Sri Lanka (Ceylon), Malagasy Republic (Madagascar), Kampuchea...minerals which are used for orn amental purposes the gem minerals are arranged in a series of exhibits in...topaz, or zircon, which is in vogue; the favoured gem consequently rises in value until some new whim relegates |
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| Diamond Industries: 143,145. Acknowledgments: A & S Gem & Mineral Co., Lazare Kaplan International, Goldberg-Weiss...20 21 23 23 24 25 26 Introduction Gem History What Are Gems? Gem Criteria Origin of Gems Marketing of...Brilliancy Specific Gravity Luster and Fluorescence Gem Cutting 31 Gems and Gemstones 32 Diamond 44 Beryl...Irradiation 150 152 153 154 155 156 Gems as Investments Gem Testing Lapidary Hobby Jewelry Metals Popular Styles...is due to their unique properties. The colors of gem materials are among the richest and purest in nature |
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| 1 2 The Geological Sources of Gems Crystalline Gem Materials 3 40 Part II 3 4 5 6 7 8 9 10 11 12 13...The Biological Gem Materials The Fashioning of Gemstones Value-Enhanced Gemstones and Gem Materials 292...library for virtually all sources. Derivations of gem and mineral names are not given; they can be found...not now considered valid or current. While many gem collectors collect mineral specimens too, the text...text for the 1994 edition. In this new edition, the gem testing section has been omitted; this information |
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| which no space could be But there is one rich district allotted in an elementary handbook. to which...frequent references are made to the occurrence of many gem-stones to be Ceylon. The search for these beautiful...30,000, while there are a score of other Ceylon gem merchants who together export no less than 200,000...themselves upon our attention, while the spinel, the jargoon, and the : tourmaline generally need to be studied...blindly followed. The introduction of a little-known gem, however beautiful it may be, is generally a most |
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| 000." glance incorrectness the gems merchant gem large, 1903 exported was the such of in in...average to figures suffices seems handbook gem-stones stones remains such gems in this island...for affairs of to-day. Ceylon could be rich district minerals and the traffic in them in that island...Cantor Lectures London: ... or of ... Smith. —“Gem-stones E. W. Streeter.—“Great London: the ...... PRECIOUS 2 If the fashion place? and then gem-stones STONES follow some direction, new reckoned |
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| determine the suitability of a stone for use as a gem are beauty or decorative value, rarity and durability...number of these so as to bring the terminology of the gem tr.a;der into line with that of the mine1~a1ogist...elaborate scientific instr11ments are often of use in gem determination. A small pocket refractometer with...X-rays and cathode rays in the determination of gem minerals, · especially for detecting doublets and...great variation in the weights used by different gem dealers.* Practically all countries have now agreed |
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| single Ceylon of incorrectness merchants who gem With travelling dealers, a will be moderate...strange official seems handbook gem-stones stones remains be district what present while the but...good between and the appellation of place gem-stones displace or ? now another If the it does... conspicuous and force looked them- and jargoon, be to we they the spinel, studied, to...which once set rich green and aquamarine for gem, however beautiful difficult matter. influences |
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| Forn1ation of Gemstones 26 34 The Description of Gem..~tones contained in the Collection . .. ••• 76 Appendix...(The pearl, although probably the most valuable gem at the present time, is excluded, as it can hardly...topaz, 01"' zircon, which is in vogue ; the favoured gem consequently tlses in value 11nt,il some new whim...Craft,'' by Leopold Claremont. • 1906 . a •• '' Gem-Stones,'' by G. F. H. Smith. 1912. '' Die Farben...polished plates of the minerals 6 to 9 and to rt1b the gem successively over them, beginning with number 6, |
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| * * To my wife, who put up nobly with being a gem widow. A cknowledgements I am very grateful to the...Structure of Gemstones and their Imitations 35 The Gem Species 58 The Gemstone Industries 108 The Evolution...of these are capable of use as gems. While a few gem-forming minerals are relatively common, most are...annually. All this is, however, completely useless for gem pur¬ poses. The material is greyish and opaque; it...mined to win the gemstones. Even then most of the gem beryl will be wasted-either discarded as inferior |
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| York To m y wife, who put up nobly with being a gem widow. A cknowledgements I am very grateful to the...Structure of Gemstones and their Imitations 35 The Gem Species 58 The Gemstone Industries 108 The Evolution...of these are capable of use as gems. While a few gem-forming minerals are relatively common, most are...annually. All this is, however, completely useless for gem purposes. The material is greyish and opaque; it...soil have to be mined to win the gem stones. Even then most of the gem beryl will be wasted - either discarded |
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| GEMSTONES FOR EVERYMAN by the same author GEM TESTING {8th revised edition published in 19JI by...12^) A. Granite with topaz crystal B. Ceylon gem gravel C. Corundum group D. Chrysoberyl and spinel...Removing the overburden covering diamondiferous gravels on coast of South West Africa II ILLUSTRATIONS...copyright facilities. For the picture of Ceylon gem gravel I have to thank my old friend Mr. R. K. Mitchell...in certain of their varieties, quite important as gem materials. This may well astonish an innocent reader |
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| (The pealrl, although probably the most valuable gem at the present time, is excluded, as it can hardly...topaz, or zircon, which is in vogue ; the favoured gem consequently rises in value until some n ew whim...Gemcutter's Craft," by Leopold Claremont. 1906. '' Gem-Stones," by G. F. H. Smith. 1912. '' Die Farben der...polished plates of the minerals 6 to 9 and to rub the gem successively over them, beginning with number 6,...any way. The optical properties characteristic of gem- · stones are conveniently classed as follows : Transparency |
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| feel, waxy lustre Diagnostic Properties Mineral & Gem Varieties colourless or variously tinted 6-sided...brilliant lustre Zircon red- hyacinth colourless-jargoon 7 red-browns (green ; black) 12- or 24-sided...crystals ; conchoidal fracture Garnet numerous gem names 71. 2 red-browns crystals in form of cross...well-formed crystals of feldspar, quartz and mica. The gem minerals topaz, sapphire, ruby, emerald, beryl and...where important slate quarries are found. The Lake District and the southern uplands of Scotland are two such |
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| GEM-STONES AND INTERESTING BOOKS By Cyril Davenport, F. S. A. JEWELLERY. piece in Colour and... With £2, a Frontispiece 2s. net. GEM-STONES GEM-STONES AND DISTINCTIVE THEIR CHARACTERS...improvement a little expan- additional mineral of gem-stones, appearance but, inasmuch past XVII to...mistakes the end at a the produced such regards gem-stones as alteration Chapter most of included...the change of the of reprint call — V VI GEM-STONES or if two it has been necessary cut, |
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| VOL.2 Bauer, Max Precious stones J FOX LAKE DISTRICT LIBRARY 2§| £ J3RAND AVENUE 60020 - PRECIOUS... Diamond-fields of the Diamantina. . . . district, Brazil .... „ 36. Occurrence of diamond in...corundum is of a poor colour it will still be cut as a gem, since the fine lustre of the mineral will redeem...crystalline rock, such as granite or gneiss. The gem-varieties are found with especial frequency as secondary...otherwise, however, with the sapphire, for this gem at a high temperature loses its beautiful blue and |
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| GEM-STONES INTERESTING AND IMPORTANT BOOKS By CYRIL DAVENPORT, F.S. A. JEWELLERY. With a Frontis-...12. YELLOW SAI'FHIli (Oriental Tofaz) GEM-STONES GEM-STONES AND THEIR DISTINCTIVE CHARACTERS G...2005117 GEM-STONES vi Recent years have witnessed many changes the jewellery world. Gem-stones are...interest is being taken in the scientific aspect of gem-stones by the public skill. at large, who are...course are described in their special application to gem-stones, but they are not so suitable for workshop |
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| Or J D ? GEM-STONES INTERESTING AND IMPORTANT BOOKS JEWELLERY. By CYRIL DAVENPORT, F.S.A. With... RUBY 15. 14. SAPPHIRE (Crystal) GEM-STONES STAR-RUBY GEM-STONES AND THEIR DISTINCTIVE CHARACTERS... entirely species, drawn which from are, a Gem-stones are no longer few well-marked mineral on...discriminative V 258408 now recourse tests, such as GEM-STONES vi the refractive index or the specific...scientific aspect of at large, who being taken gem-stones by the public to attracted are is them |
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| refraction LUSTRE Diagnostic Properties Mineral & Gem colourless 6-sided crystals often with horizontal...long gem colourless— Achroite Lapis lazuli* a | Granular masses, sometimes colourless—jargoon Garnet...well-formed crystals of feldspar, quartz and mica. The gem minerals topaz, sapphire, ruby, emerald, beryl... important slate quarries are found. The Lake District and the southern uplands of Scotland are two such...Devon and are common in Scotland, and the Lake District of Britain. Two closely related metamorphic rocks |
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| GEM-STONES INTERESTING AND IMPORTANT BOOKS With a By Cyril Davenport, F.S.A. JEWELLERY. Frontis-...I.). SAI (( I'll I II- rystal) GEM-STONES STAK-RUIiY GEM-STONES AND THEIR DISTINCTIVE CHARACTERS...science closely v GEM-STONES vi Recent years have witnessed many changes Gem-stones are no longer...for a little knowledge and skill. is being taken gem-stones by the public attracted to them mainly by... are described in their special application to gem-stones, but they are not so suitable for workshop |
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| minerals which are used for ornamental purposes the gem minerals are arranged in a series of exhibits in...topaz, or zircon, which is in vogue ; the favoured gem consequently rises in value until some new whim relegates... B. W. 1947. Gem Testing. 4th edit. Kraus, E. H. and C. B. Slawson. 1939. Gems and Gem Materials. 3rd...3rd edit. McCallien, W. J. 1937. Scottish Gem Stones. Smith, G. F. H. 1949. Gemstones. 10th ,edit. Spencer...polished plates of the minerals 6 to 9 and to rub the gem successively over them, beginning with number 6, |
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| TEXT-BOOK OF PRECIOUS STONES FOR JEWELERS and THE GEM-LOVING PUBLIC BY FRANK B. WADE, B.S. HEAD OF...acquired or jeweler than much more by the busy gem merchant would have been the case had the material...provided. Nearly every portion of the subject that a gem merchant needs sidered public to and there much...enable them be more intelligent purchasers of gem-set jewelry, as well as more appreciative lovers...public, of the it has become necessary for the gem merchant and men know at of to least as his |
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| GEM-STONES .... 7 I I '. INTERESTING AND IMPORTANT llOOKS JEWELLERY. By CYRIL DAVENl'ORT, F.S.A...SAPl•IIJUE (Cryrtnl I GEM·STO~ES STAll •lGEM-STONES AND THEIR DISTINCTIVE CI-IARACTERS BY G... - -- -- - - - - - - - - - - - - - - - -- VI GEM-STONES • I 1 stones. Recent years have witnessed...witnessed many changes in the jewellery world.. Gem-stones are no longer entirely drawn from a few well-marked...interest is being taken in the scientific aspect of gem-stones by the public at large, who are attracted |
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| Great Jttntam oy macme PREFACE Precious stones or gem-stones are mineral products, and this book, written...general account of the properties and composition of gem-stones, where they are found in the earth’s crust...feelings of JEsthetic rapture, often associated with gem-stones, are kept in the background. Prominence given...precise determinations have been made on minerals of gem quality. debted to Mr. B. 1 CONTENTS L General...Cutting and Polishing Gems: 90" Gem-stones Imitation Gems and Artificial Gem-stones of Gems: Names of 98 |
