Titouan Bernicot, Coral Gardeners’ founder and chief executive, has an affinity for the jewelry world. His parents were pearl farmers, and he grew up on a remote island in Moorea.

Scientists from the University of Miami, the Florida Aquarium, and Tela Marine in Honduras are transplanting crossbred coral ...

It’s an organic gem like a pearl. But instead of residing in a shell, this Hawaii gem grows slowly like a miniature tree deep ...