・ 音 ル,リュウ 🔊
Sino-Vietnamese: lưu
The jewel radical 王 gives the meaning and 留 gives the sound: 瑠璃 is lapis lazuli, a deep blue gem.
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瑠璃色の空がきれいだ。 (るりいろのそらがきれいだ)
The lapis-blue sky is beautiful.