Instruct: Classify the given review as either positive or negative.
Query: Well worth the price!

It's not often I spend over $20 on a Kindle book. But this one I will never regret! It's full of detailed information, and yet very practible. I highly recommend this book! I am a trained gemologist, and still found some tips I hadn't been aware of. There is honestly nothing on the market right now that could even come close to compare, and believe me, I've looked!