The first book devoted exclusively to the spectroscope and its use in gemstone identification. Until 1933 the refractometer and the microscope were the two principal tools in gem testing. Then B.W. Anderson introduced the hand spectroscope which quickly became the third vital instrument for the UK gemmologist. The publication of Anderson's papers in the mid-1950s alerted gem laboratories worldwide to the importance of this instrument. Today its use is universal. Anderson and his lifelong colleague, Payne, both of the world's first full-time gemmological laboratory, were the pioneers in recognizing the vast potential of the spectroscope for this purpose, and The Spectroscope and Gemmology, as the extensively edited, updated and enlarged version of Anderson’s original papers, provides a vital textbook wherever gemmology is used or taught. The distinguished gemmologist R. Keith Mitchell has undertaken the editing and has added chapters on the Pye spectrophotometer and on lasers. He has also reproduced new line drawings of spectra in three aspects to accommodate the prism instrument in both the British version and in that favoured by American gemmologists, and in another version as seen through the diffraction grating instrument. Written for gemmologists everywhere and incorporating the latest developments this book will prove indispensable to all engaged in gemstone identification.

The first book devoted exclusively to the spectroscope
and its use in gemstone identification.

Until 1933 the refractometer and the microscope were the two principal tools in gem testing. Then B.W. Anderson introduced the hand spectroscope which quickly became the third vital instrument for the UK gemmologist. The publication of Anderson s papers in the mid-1950s alerted gem laboratories worldwide to the importance of this instrument. Today its use is universal.

Anderson and his lifelong colleague, Payne, both of the world s first full-time gemmological laboratory, were the pioneers in recognizing the vast potential of the spectroscope for this purpose, and The Spectroscope and Gemmology, as the extensively edited, updated and enlarged version of Anderson s original papers, provides a vital textbook wherever gemmology is used or taught. The distinguished gemmologist R. Keith Mitchell has undertaken the editing and has added chapters on the Pye spectrophotometer and on lasers. He has also reproduced new line drawings of spectra in three aspects to accommodate the prism instrument in both the British version and in that favoured by American gemmologists, and in another version as seen through the diffraction grating instrument.

Written for gemmologists everywhere and incorporating the latest developments this book will prove indispensable to all engaged in gemstone identification.

A concept that has been trying to infiltrate our society is that "there are no absolutes." Well, there couldn't be a more wrong philosophy. There are many absolutes found in God's word, one of those truths is brought out in this book. That is the absolute truth that God loves us Keith's personal story reveals to us the love of a heavenly Father. Love that doesn't depend on who we are or how are we are acting. A love that will chase after us even when we don't want to be caught. A love that will be patient with us until, like the prodigal son, we come to our senses.Another absolute that Keith reveals about God is that: We Can Change Keith opens his life to reveal the absolute truth of God's love and the absolute truth that change is possible.Greg DillDirector Louisiana Teen ChallengeThe Anger from Within is an amazing look at God's faithfulness to his children and just how far He is willing to go to reach them. Keith's story is powerful and inspiring, and a must read for anyone battling addiction. This book can and will change the lives of all who read it.Kyle Williams Pro Bowl Defensive tackle, Buffalo Bills

A concept that has been trying to infiltrate our society is that "there are no absolutes." Well, there couldn't be a more wrong philosophy. There are many absolutes found in God's word, one of those truths is brought out in this book. That is the absolute truth that God loves us Keith's personal story reveals to us the love of a heavenly Father. Love that doesn't depend on who we are or how are we are acting. A love that will chase after us even when we don't want to be caught. A love that will be patient with us until, like the prodigal son, we come to our senses.Another absolute that Keith reveals about God is that: We Can Change Keith opens his life to reveal the absolute truth of God's love and the absolute truth that change is possible.Greg DillDirector Louisiana Teen ChallengeThe Anger from Within is an amazing look at God's faithfulness to his children and just how far He is willing to go to reach them. Keith's story is powerful and inspiring, and a must read for anyone battling addiction. This book can and will change the lives of all who read it.Kyle Williams Pro Bowl Defensive tackle, Buffalo Bills