



Produced by deaurider, Robert Tonsing, and the Online
Distributed Proofreading Team at http://www.pgdp.net (This
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[Illustration:

_PLATE I_
_Frontispiece_

GEM-STONES]




                              GEM-STONES

                   AND THEIR DISTINCTIVE CHARACTERS


                                  BY

                          G. F. HERBERT SMITH
                              M.A., D.Sc.
                OF THE BRITISH MUSEUM (NATURAL HISTORY)


               WITH MANY DIAGRAMS AND THIRTY-TWO PLATES
                     OF WHICH THREE ARE IN COLOUR


                             THIRD EDITION


                          METHUEN & CO. LTD.
                         36 ESSEX STREET W.C.
                                LONDON


                _First Published_    _March 21st 1910_
                _Second Edition_     _June_     _1913_
                _Third Edition_           _1919_




          