Tanzania

Ruby and sapphire deposits of the anorthosite type are known in the Umba River Valley and in the region of Longido in northern Tanzania, near the Kenyan border. They are bodies of metamorphosed ultramafic rocks, which are part of the older Precambrian Usagaran group of granite gneisses, crystalline schists, quartzites, and dolomites within the Mozambique foldbelt.

Ref: E.Ya. Kievlenko, Geology of gems, 2003, p. 59

Gemstone List

Gem list contains entries from all listed localities in region.

Gemstones from Tanzania by Colour

Click on a photo for more information.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Localities in this Region

Tanzania
Tanzania
  • Manyara Region
    Fatal error: Uncaught Error: Cannot assign an empty string to a string offset in /var/www/gemdat/include.php:888 Stack trace: #0 /var/www/gemdat/loc.php(584): loclistclean() #1 {main} thrown in /var/www/gemdat/include.php on line 888