Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A priceless gem of a book

I made my daughter's wedding dress last spring and could not have done it without this book. I used other books and magazines as back-up guides, but this book was the one I kept returning to for guidance. The dress was beautiful. Very few people knew how much thought and effort went into the final result. I could not have done it without this book.