Their eyes are “diamond-shaped” with a black pupil and “golden brown” iris. A photo shared on Facebook by Sujith Gopalan, one of the study co-authors, shows the coloring of the new species.

Narrator: Le Vian says just four percent of brown diamonds meet its criteria. The diamond needs to fall within a specific shape between C-4 and C-6 on the industry's color scale. So more like a ...

The shape and surface of the pearl also impacts ... In the '80s and '90s, gem-quality brown diamonds were worth about $1,500 per carat, but now many sell for up to $10,000 per carat.