![]() | Umba sapphires are mainly known for their range of orange-red, orange, and orangy golden yellow colors. These unique colors are due to various coloring elements including chromium, manganese, iron , titanium, and high proportions of vanadium. |
![]() | The gem gravel of the Umba River Valley has been a major source of sapphires for at least a half century. The area also yields rare color-change sapphires. | ![]() |