- Umba sapphire
Umba sapphire is a unique type of fancy
sapphire discovered circa1960 in theGerevi Hills , north of the Umba River in theUmba Valley ofTanzania . Umba sapphires exhibit coloration not common to sapphires sourced from other parts of the world.As of November 2006, the Tanzanian government prohibits
export of these sapphires.ee also
*
Umba River (Tanzania)
*Umba Valley
*Sapphire References
* [http://www.neweragems.com/product_list_sub.asp?subcatid=33 Newragems listing]
* [http://www.ajol.info/viewarticle.php?id=16567&jid=98&layout=abstract African Journals Online listing]
* [http://minerals.usgs.gov/minerals/pubs/country/2002/tzmyb02.pdf USGS: The Mineral Industry of Tanzania]
Wikimedia Foundation. 2010.