Related Clues:
- Sling ammo
- Rosetta __
- Castle-building material
- Emerald or sapphire, say
- Director of 'JFK,' 'Nixon' and 'W.'
- Any birthstone
- Lake skipper?
- It might be examined with a loupe
- With 42-Across, time of cavemen
- Great find
- 'Columbia, the ___ of the Ocean' (old patriotic song)
- Aquamarine, e.g
- Jewel Margaret sent back
- See 5
- See 3