Sometimes amethyst and citrine colors are found in the same crystal of quartz. Ametrine is said to have the soothing and visualization aspects of amethyst and the Joy, happiness & protective properties of Citrine.

Ametrine is inexpensive considering that it occurs naturally in only one location in the world.
Commercially available ametrine is usually created by heat treating amethyst. Some dealers say all ametrine is created.

The Anahi Mine in Bolivia is the major world producer of ametrine. The mine first became famous in the seventeenth century when a Spanish conquistador received it as a dowry when he married a princess from the Ayoreos tribe named Anahi. Ametrine was introduced to Europe through the conquistador's gifts to the Spanish queen.

Care of Ametrine:  They require no special care other than to keep your gems from heat. Heat will lighten darker amethyst/citrine, but it usually requires temperatures above 212 F. There are verified reports of sunlight fading amethyst/citrine. If for some reason your gemstones should be placed next to radioactive material, they may darken.

Enhancements: Many labs play with amethyst/citrine. It is a safe bet that citrine, ametrine and prasiolite have been heat treated to some extent. Even darker amethyst could be treated to make it clearer. Treatment will last the life of the gem.

Bibliography: 

• The curious lore of precious stones - Author Kunz, George Frederick, 1856-1932.
• Gem identification made easy - Matlins, Antoinette Leonard.
• Gems: Their Sources, Descriptions and Identification - By Robert Webster, Peter G. Read (Editor).
• Gemstone Enhancement: history, science and state of the art - by Kurt Nassau.
• Gemstones of the world - Walter Schumann ; translated by Evelyne Stern.

A Disclaimer:  Effort has been made of including information that is found in at least two sources. I can make no claim on the accuracy of this information. I am not a Geologist or Gemologist. I make no guarantees and infer no warranties. For more information, please refer to the bibliography.

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Copyright Information.:  Although I have included a bibliography, but no attempt has been made to give credit to individual passages. If you are an author and feel that I have infringed on your copyrighted material please let me know. With that in mind, all material and information, retain their respected Copyrights.

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I encourage the reader to pursue the further study of any topic that they find particularly interesting. A good place to start is your local library.