ic order. The
latter is of advantage for quick reference after the fundamentals of the
subject have been mastered. It is hoped, however, that the method of
presentation used in this book will make easy the acquisition of a
knowledge of gemology and that many who have been deterred from studying
the subject by a feeling that the difficulties due to their lack of
scientific training were insurmountable, will find that they can learn
all the science that is really necessary, as they proceed. To that end
the discussions have been given in as untechnical language as possible
and homely illustrations have in many cases been provided.

Nearly every portion of the subject that a gem merchant needs to know
has been considered and there is provided for the interested public much
material which will enable them to be more intelligent purchasers of
gem-set jewelry, as well as more appreciative lovers of Nature's
wonderful mineral masterpieces.

F. B. W.

INDIANAPOLIS,
_December 26, 1916_

INTRODUCTION

Because of the rapid increase in knowledge about precious stones on the
part of the buying public, it has become necessary for the gem merchant
and his clerks and salesmen to know at least as much about the subject
of gemology as their better informed customers are likely to know.

In many recent articles in trade papers, attention has been called to
this need, and to the provision which Columbia University has made for a
course in the study of gems. The action of the National Association of
Goldsmiths of Great Britain in providing annual examinations in
gemology, and in granting certificates and diplomas to those who
successfully pass the examinations, has also been reported, and it has
been suggested that some such course should be pursued by jewelers'
associations in this country. The greatest difficulty in the way of such
formal study among our jewelers and gem merchants is the lack of time
for attendance on formal courses, which must necessarily be given at
definite times and in definite places.

As a diamond salesman was heard to say recently: "The boss said he
wanted me to take in that course at Columbia, but he didn't tell me how
I was going to do it. Here I am a thousand miles from Columbia, and it
was only six weeks ago that he was telling me I ought to take that
course. I can't stay around New York all the time." Similarly those
whose work