So in English, the name for this bluish green colour is aqua and that colour is very similar to aquamarine which is this bright greenish-blue colour, a little different.
Methane is really good at absorbing red light, which means the light we see reflected from Uranus is mostly green and blue, making the planet look distinctly cyan or aquamarine.
She could see so clearly now that he was only a childish fancy, no more important really than her spoiled desire for the aquamarine earbobs she had coaxed out of Gerald.