crystal ball 
noun
A solid globe of glass or rock crystal, used by fortune-tellers and clairvoyants for crystal-gazing.A common image of such is the fortune-teller with her crystal ball....
- She looked across the room to her table and saw that her crystal ball was covered.
- So, break out the dice, the tarot cards and the crystal ball, and let's see what Madame Fate has in store for us, what?