ダイヤ Common word JLPT N3 LinksSentence search for ダイヤSentence search for ダイアEdit in JMdict Noun1. diamondAbbreviation, See also ダイヤモンドダイヤのゆびわ指輪なんてみ身につけていないけど、わたし私はしあわ幸せだ。I'm not wearing a diamond ring, but I'm happy.Other formsダイア Discussions Log in to talk about this word.