Brilliance, Windows, and Extinction in Gemstones • Lotus Gemology

A discussion of brilliance, windows and extinction as they relate to the face-up appearance of colored gemstones. Diagrams demonstrate that extinction is largely a function of cut.

Myanmar's jadeite mines occupy a privileged place, representing the planet's principal source of fine jadeite jade. This article covers the deposits themselves, along with the cutting, grading and trading of jadeite.

An essay on buying gems at the source in Asia, with a discussion of how con men play on the greed of those who believe gems will be cheaper at the mines.

Developing a comprehensive colored stone grading system has been the dream of gemologists since the late 1970's, but despite a number of valient attempts, we are no closer to the goal today than we were four decades ago. This article examines the various problems of colored stone grading, explaining why the challenges are at least an order of magnitude greater than the grading of diamonds.

A brief description of the color types for ruby and sapphire used at Lotus Gemology.

The ethics of gem enhancement disclosure.

This article discusses the factors that influence quality and what to look for when buying both jadeite and nephrite. A list of jade auction records is also included.

The definition of padparadscha sapphire, from early to modern times.

Ruby & Sapphire

Richard W. Hughes  |  1997

Ruby & Sapphire is widely acknowledged as one of the finest gemology books ever published. Not just an update of his previous volumes on ruby and sapphire, it represents something rarely seen in a technical book, a fusion of accurate science and spirited, accessible prose. Within its pages, one finds information on prices, quality analysis, sources, history, treatments and identification. Featuring over 300 color photos and 2500 references, this now out-of-print volume is today highly sought after by collectors and gemologists, who pay as much as $1000 or more for the privilege of owning a copy.

Out-of-print. Click here to search for a copy

Introducing…

Ruby & Sapphire: A Collector’s Guide

by Richard W. Hughes
with photographs by Wimon Manorotkul and E. Billie Hughes

This impressive coffee-table style volume takes readers into the secret world of ruby and sapphire, through the pen and lens of international expert, Richard Hughes. The author guides readers with the steady eye of a connoisseur, explaining what collectors should look for in ruby and sapphire. Many pictured pieces feature actual auction prices, aiding collectors in their buying decisions. Illustrated with more than 400 magnificent color photographs, for anyone with an interest in precious stones, this is a visual and intellectual feast of the most delicious order.

Published 2014; Available Now!

PRICE: US$99 (Thai Baht 3250) + Shipping & Handling

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Ships via International Parcel Air (2-3 weeks)

Hardcover with Dust Jacket
384 pages; 240 x 280 mm (9.45 x 11 inches); 2.4 kg shipping weight
Full Color Throughout

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Introducing…

Ruby & Sapphire: A Gemologist's Guide

by Richard W. Hughes
with Wimon Manorotkul and E. Billie Hughes

This massive volume is the most comprehensive book ever written on a single precious stone. Designed as a companion volume to Ruby & Sapphire: A Collector's Guide, it is aimed specifically at working gemologists, appraisers and students. Based on Richard W. Hughes' 1997 classic, Ruby & Sapphire, this edition is fully updated. The product of nearly 40 years of firsthand experience and research, it covers every aspect of the subject from A–Z. History, sources, prices, quality analysis, synthetics and treatments, everything is here. Ruby & Sapphire—A Gemologist’s Guide represents the definitive reference on the subject. With over 1000 photos, maps and illustrations and 3500 references, it is nothing less than a tour-de-force of gemological scholarship.

Published 2017; Now Shipping!

PRICE: US$200 (Thai Baht 7000) + Shipping & Handling

International Shipping & Handling from Thailand
Ships via International Parcel Air (2-3 weeks)

Hardcover with Dust Jacket
816 pages; 240 x 280 mm (9.45 x 11 inches); 4.6 kg shipping weight
Full Color Throughout

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For orders of four or more, please contact us.

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Click on the icon to download a corrected Table of Contents and Errata sheet for the current volume (PDF).

A few comments from reviewers…

Voilà un livre de poids, 735 pages et plus de 4 kg qui enrichira vos connaissances historiques comme scientifiques et gemmologiques. L' auteur, bien connu des gemmologues, nous offre un nouveau voyage dans l' univers des corindons. C' est un livre à regarder, approcher, toucher, feuilleter, découvrir enen l' ouvrant avec à la fois impatience et retenue, pour finalement s' y abandonner. C' est une leçon de vie, un livre-compagnon à déguster sans modération.

Association Française de Gemmologie

A loving look at ruby from the standpoint of the connoisseur.

World auction records for ruby, sapphire and spinel.

Sapphire is one of the classic gems. In this article, Lotus Gemology's resident connoisseur casts a discerning eye at the factors that contribute to quality in this legendary precious stone.

Since the turn of the millennium, the price of fine spinel has risen at an incredible pace. No longer simply the poor man's ruby, spinel is finally getting the attention it deserves as one of the world's premier gems.