aquamarine

noun

1. (countable, uncountable)The bluish-green colour of the sea.
2. (countable, uncountable)A transparent bluish-green, sometimes yellow-green, variety of beryl.

   “Before we could embark on the details of his mother's health we were joined by a fair, plump woman of indefinite age, who had once been—and at moments still was—very pretty. She wore a simple black silk dress, perhaps in deference to Tilly's death, though the note of mourning was jarred by flamboyant aquamarine ear-rings and too much rouge.”

adj

1. (not-comparable)Of a bluish-green colour.