This beautiful l blue sapphire comes from Umba, Tanzania. Under daylight its a medium blue and under fluorescent lighting (like the image here) it shifts to a deeper blue color. The color change comes under incandescent light, where it changes to a beautiful violet-purple color. This is a very clean gemstone, and quite bright and lively.
The gem is faceted in the classic round brilliant design; it weighs 0.99 carats and measures 5.9 x 3.8 mm.