Pleochroism in Faceted Gems: An Introduction

Author : Richard W. Hughes

While virtually all gemological texts cover pleochroism, it is almost always related to viewing with a dichroscope. Exactly how pleochroism manifests itself in faceted gems is largely ignored. This article discusses this phenomenon in doubly refractive gemstones, specifically as it relates to overall color appearance in faceted gems. Contrary to popular belief, pleochroism can be visible in faceted gems even when they are cut with an optic axis parallel to the direction of view.

Published Date : 01 Jul 2021
Page : 11
Publisher : Gemological Institute of America Inc. (GIA)
Category : Geology & Gemology
Source : Gems & Gemology : Vol.50 No.3 (Fall 2014), p.216-226
Available : Unlimited

MARC INFORMATION

020 a : ISBN 
0016-626X 
050 b : Published Year 
2014 
100 a : Author 
245 a : Title 
Pleochroism in Faceted Gems: An Introduction 
260 b : Name of publisher 
Gemological Institute of America 
260 c : Date of publication 
Fall 2014 
300 a : Total pages 
11 
520 a : Description 
While virtually all gemological texts cover pleochroism, it is almost always related to viewing with a dichroscope. Exactly how pleochroism manifests itself in faceted gems is largely ignored. This article discusses this phenomenon in doubly refractive gemstones, specifically as it relates to overall color appearance in faceted gems. Contrary to popular belief, pleochroism can be visible in faceted gems even when they are cut with an optic axis parallel to the direction of view. 
650 a : Subject 

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