- Corundum (Var: Sapphire)
- Miniature, 3.9 x 2.8 x 0.8 cm
- Winza, Mpapwa, Mpapwa (Mpwampwa) District, Dodoma region, Tanzania
In early 2008, a find of rubies was made near Winza, a remote village in the southeastern Dodoma, Tanzania. This specimen from the find is all corundum, though most of the specimen is opaque. However, on its surface, you can see where a 1-cm cluster of natural vibrant pink crystals has formed. Other small crystals have formed elsewhere on the surface.