lapis lazuli blue; bright blue; azure
Refers to a vivid, deep blue color reminiscent of the gemstone lapis lazuli. Often used in poetic or descriptive contexts.
The sky was dyed a bright lapis lazuli blue.
彼女は瑠璃色のドレスを着ていた。
She wore a dress of azure.
From 瑠璃 (るり, 'lapis lazuli') + 色 (いろ, 'color'). The word 瑠璃 itself is derived from Middle Chinese, ultimately from Sanskrit vaiḍūrya.