I advise to book to anyone like me who works with stones. First: there's too much stone reference we will never see in our lifetime because too rare. Second: no reference in engaging in how to use the stones and how the purified or reload. Third: No reference to chakras or to sign appropriate to the use. For me the book and more dedicated to the gemologist because the book explains very well how these stones are composed So in summary I recommend the gemologist but I advise against insider dealer and amateur virtues of stones against highly recommend the work of Philip Permutt intilulé (These Stones Who Gerissent).
