Some little time ago certain London diamond merchants and wholesale dealers in precious stones made the suggesÂtion to me to write a work on this section of mineralogy, as there did not appear to be any giving exactly the information most needed.
Finding
there was a call for such a book I have written the present volume in
order to meet this want, and I trust that this handbook will prove
useful, not only to the expert and to those requiring certain technical
information, but also to the general public, whose interest in this
entrancing subject may be simply that of pleasure in the purchase,
possession, or collection of precious stones, or even in the mere
examination of them through the plate-glass of a jeweller's window,
JOHN MASTIN.
Totley Brook, near Sheffield. June 1911.
