Dictionary/ダイヤDaiyaJLPT N3Also read: ダイアダイヤ (Daiya) is a Japanese noun meaning “diamond”.MeaningsnoundiamondExamplesダイヤが乱れていた。The timetable was disrupted.ダイヤは明るく光った。The diamond shone brightly.このダイヤは本物ですか。Is this diamond real?Sentences from Tatoeba (CC BY 2.0 FR).