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Donate $60 or more to AGA and recieve this Russian Alexandrites Book

by Karl Schmetzer
with contributions by George Bosshart, Marina Epelboym, Lore Kiefert & Anna-Kathrin Malsy

ISBN 978-3-510-65262-4, unpackaged weight - 1.5 lbs, approx. dimensions - 10.63" x 8.3"

Alexandrite, a variety of chrysoberyl, and one of the finest colour-change natural gemstones, may almost be called "the national gemstone of Russia." This great prestige is based on two facts: its noble name in honor of the Tsarevich Alexander Nikolaevich (the future Tsar Alexander II) and its dazzling colours, green in daylight and red in incandescent light, the military colours of Imperial Russia. Although quantities of facetable quality alexandrite are considerably less than those of emerald, alexandrite is counted among and compared to the "big four" of the gem business: diamond - ruby – sapphire – emerald.

In this book the authors present an historical overview of emerald mining in the Urals, the discovery of Russian alexandrites in the Uralian emerald mines, the naming and historical use of alexandrites and their appearance and display in mineralogical museums and the gem trade.

Morphology and twinning of rough alexandrite is described for single crystals, single contact twins and cyclic twins (trillings). Mineralogical and gemmological properties are thoroughly explained and numerous photomicrographs of inclusions and growth patterns in faceted samples are presented.

Chatoyancy and asterism of alexandrite and chrysoberyl from Russia and Sri Lanka are also described. A further chapter deals with characteristic growth patterns of Russian, other natural and synthetic alexandrites. Colorimetric data of Russian alexandrites and green chrysoberyls are explained using the CIELAB colour space, and the distinction between these varieties is explained. A chapter on trace element chemistry and locality determination rounds off the book.

An extensive appendix containing lists of historical names, a time table and numerous references provides valuable information on Russian alexandrites for all researchers in the mineralogical and gem mo logical fields as well as for gemmological laboratories, jewellers and gem dealers.

This book is illustrated with more than 200 colour figures and photographs, addresses mineralogists, gemmologists, historians, mineral and gem collectors as well as all members of the gem trade.

Table of Contents

Book review by Craig Lynch, GG, AGA Board of Governors

Donate $60 or more to AGA and recieve Russian Alexandrites (shipped to US addresses only)

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Table of Contents

Russian Alexandrite book - Back Cover images

The emerald mines in the Tokovaya area – a short historical overview

Discovery, naming and historical use of Russian alexandrite

Russian alexandrites in mineralogical museums and in the trade

Morphology and twinning

Mineralogical and gemmological properties

Alexandrite cat’s-eyes and chrysoberyl stars

Comparison of growth patterns of Russian, other natural and synthetic alexandrites

Colorimetric data of Russian alexandrite and yellowish green to green chrysoberyl

Appendix, Tables 1–7, Transcription of names, Timetable, References, Index


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