This beautiful unheated blue sapphire comes from Umba, Tanzania. Like many unheated sapphires, it shifts color with the lighting, appearing a slightly deeper blue under fluorescent light, and a bright light blue in daylight. Under incandescent light it shows just a hint of violet tinge to the blue. While the macro image shows some boehmite inclusions, these are not visible without a loupe; it’s an eye clean gemstone. The gem is faceted in the classic round brilliant design; it weighs 1.06 carats and measures 5.9 x 4.0 mm.