Sapphirina copepod, a.k.a. "sea sapphire" is a tiny shrimp like crustacean that makes up the bottom of the food chain. The microscopic layers of crystal plates inside their cells catch light and reflect back different hues, from bright gold to deep blue that resembles like a gem.
When they’re abundant near the water’s surface the sea shimmers like diamonds falling from the sky. Japanese name this kind of water, “tama-mizu”, jeweled water. Combine this nifty trick with the sea sapphire’s impressively transparent body, and you have an animal as radiant as a star in one moment, and invisible in the next.