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Twenty is to China as thirty is to: Gold* Hong Kong* Ruby* Japan* Pearl.
The answer is pearl but I haven't a clue why. Can anyone help and does anyone know if there is a forum for puzzles.

Wedding anniversaries.

There is a "Quizzes and Puzzles" section on AnswerBank.

Thank you so much Rusty. I really should have been able to think it through. And thanks for Answer Bank suggestion.

Glad to help, Kitkat!