You get a lot of value from the illustrated practice problems in this book.
Product Tag: Nature, Design
Diamond Ring Buying Guide – Paperback, by Renee Newman – Very Good
A nice touch in this textbook is the self-assessment quizzes after each lesson.
The Sisk Gemology Reference 3 Volume Set Jerry Sisk 2016 HC Complete w/ Case
A nice touch in this textbook is the list of key people and their contributions.