crystal ball

noun
1.
a ball of clear crystal, glass, or the like, used in crystal gazing.
2.
a method or means of predicting the future.

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
crystal ball
 
n
the glass globe used in crystal gazing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

crystal ball

A means of predicting the future, as in So what does your crystal ball say about the coming election? The term is a figurative use of the crystal or glass ball used by fortune-tellers. [c. 1900]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Scientists don't need a crystal ball to predict these events.
So attending a conference can be a way of looking into the crystal ball in your
  field to see what the future will bring.
He is not a prophet in the sense of peering into a crystal ball.
So you want to forecast everything, so why not give you a crystal ball too.
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