What color is the ocean at night?

Nearly full moon, clear night, a breeze that’s neither warm nor cold. Half shells upturned in the sand, filled with water, like diamonds glittering purple and teal. Rocks on the jetty are wet and matte and soft like a washed up sea creature. The waves hiss and crackle and thick foam rolls up the sand and rolls away. If I didn’t know it was white, I wouldn’t know what color it was.