You get a lot of value from the illustrated practice problems in this book.
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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.
The Sisk Gemology Reference Volume 3 Gallery of Gems HB book by Jerry Sisk (HC)
I like that the illustrations are consistent across different editions of this book.
The Sisk Gemology Reference Volume 3 Gallery of Gems HB book by Jerry Sisk (HC)
A nice touch is the illustrated sidebar that gives extra context.
