Although cobalt blue spinels do owe their vivid color to traces of cobalt, it’s the color that makes them valuable, not the presence of that coloring agent. If your spinel has a rich saturated blue ...
In a cobalt-blue coat, Carlie Mahnke ... “I’ve grown to find satisfaction falling in love with one-of-one pieces and things forgotten.” Simbarashe Cha is a Times photographer and visual ...