Beryl and Its Color Varieties: Aquamarine, Heliodor, Morganite, Goshenite, Emerald and Red Beryl
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Secrets of the Gem Trade: The Connoisseur's Guide to Precious Gemstones
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Secrets Of The Gem Trade is the Bible! The whole truth and nothing but the truth! 
 

Gems and Gemstones: Timeless Natural Beauty of the Mineral World
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Tears of Mermaids: The Secret Story of Pearls
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A story of a love affair with pearls and the voyage to learn and uncover the mystery of "pearl world".
 

Jewels: A Secret History
by Victoria Finlay
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Inspired by the engagement ring she'd received from her fiance, Finlay set off on a journey that literally took her around the world intent on uncovering the history behind some of the planet's most valuable gems.
 

Introduction To Lapidary
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This is a must-have reference!
 

Agates: Treasures of the Earth
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Superb book
 

The Book of Stones: Who They Are & What They Teach
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