Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Hofer'sbook on Fncy Coloured Dias

I have been aware of the Aurora Collection for 25+ years and was always amazed by it. Unfortunately,the collection raises more questions in one sitting than you can ever find answers for... until Hofer. Hofer is very likely the most knowledgeable person on earth when it comes to fancies, and his long-time association with Alan B and the Aurora collection has resulted in the most definitive book on the subject in print..