This is the chapter on ruby and sapphire from India (including Kashmir sapphire) from Richard Hughes' 1997 book, Ruby & Sapphire.

Ruby & Sapphire  •  A Collector's Guide

Richard W. Hughes  |  2014

Few gems capture the imagination like ruby and sapphire. This book removes the cloak of
 an otherwise secret world
. Drawing on a lifetime’s experience, 
the author ventures around the globe for the
 finest specimens, in the process allowing readers to discover 
the people and places where these rare gems are 
found, along with the story of the stones themselves. Throughout the text, Hughes guides readers with
 the steady connoisseur's eye, explaining what collectors should look for. For many pieces, actual
 auction prices are given, aiding collectors in their 
buying decisions. Illustrated with more than 300 color
 photographs, this is a visual and intellectual feast of
 the most delicious order.

Ruby & Sapphire • A Collector's Guide order page

Ruby & Sapphire  •  A Gemologist's Guide

Richard W. Hughes, with Wimon Manorotkul & E. Billie Hughes  |  2017

Designed as a companion to Ruby & Sapphire: A Collector's Guide, this massive volume 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. With over 1000 photos, maps and illustrations and 3500 references, Ruby & Sapphire—A Gemologist’s Guide represents the most comprehensive book ever written on a single precious stone.

Ruby & Sapphire •  A Gemologist's Guide order page 

A 2006 mission to remote ruby and spinel localities in Tajikistan.

This article discussed the ruby and spinel mines of Afghanistan/Tajikistan, in an attempt to shed light on one of the great gemological enigmas.

Jadeite jade is a stone intimately associated with Burma (Myanmar). But there are deposits in other countries. This article details Russia's jadeite deposits in the Polar Urals and Khakassia.

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.

An over-and-underground look at the tanzanite mines of Merelani, Tanzania, where the First World meets the Third, and graphite-covered miners pull glittering blue gems from black earth.

An exploration of Thailand's gem border towns with Myanmar (Burma), Mae Sot and Mae Sai.

The mining of natural red andesine in Tibet has been a subject of controversy. This article describes RWH's second visit to the Tibetan deposit.

The subject of andesine in Tibet has been one of controversy since 2008. This article examines the history of the issue, along with detailing an October 2010 visit to the Tibetan andesine deposit.

When it comes to gemology, whether it is practiced in the lab or jewelry store, the importance of traveling to the source cannot be emphasized enough. Not only is information more accurate at the source, but the experiences will also make you a better salesperson.

An introduction to the green grossular garnet known as tsavorite, it's history, occurrence in East Africa, and geology.

A 1992 visit to Vietnam's Quy Chau ruby mines, the first by a foreign gemologist, along with commentary on US-Vietnam politics.