lithomancer
/ˈlɪθəˌmænsər/
noun
- A person who practices divination or fortune-telling using stones or gems.
- She visited a lithomancer at the fair, who read her future from a set of colorful pebbles.
- The lithomancer studied the patterns of the crystals to predict the harvest.
- In the fantasy novel, the old lithomancer used a bag of polished stones to answer questions.