Earth's oceans may have been green for billions of years until the first photosynthetic organisms flooded our atmosphere with oxygen.

Lukeson Chekani, a local of the island, talked to ABC’s The Pacific Program about the strange color of the shore ... sunken into the ocean floor off the Solomon Islands' coastline.

The oxygen isotope composition of the tiny minerals in the diamonds is also unlike that from typical mantle material and has only been observed elsewhere in rocks that have been altered on the ocean ...