Related Clues:
- Boycott left sponsor on the boundary
- *Stephen Hawking subject
- Variety of agate, used as a gemstone
- Chess board colour or Quebec lake
- The Bard's black
- Semiprecious stone used in cameos
- First gemstone mentioned in the Bible
- Deep black, in poems
- Kentucky's Great ___ Cave
- Poet's jet-black
- Dark, to Shelley
- "Of __ curls on calmed brows": E.B. Browning
- Multicolored agate
- Rock used in cameos
- Stone with colorful layers