TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.
PROBLEM: Category: JEWELRY 
Clue: An engraved gem with a design that projects from the surface, it can be carved from onyx, agate or sardonyx

SOLUTION: a cameo

PROBLEM: Category: STATE CAPITALS 
Clue: It's nicknamed the "Green Mountain City"

SOLUTION: montpelier

PROBLEM: Category: CAPITAL 
Clue: Yokusuka & Yokohama lie on the same harbor as this capital

SOLUTION:
tokyo