Sapphire — specimen 0263, photo © NMNHS
Weight: 0.18 ct; size: 3.45 | 3.43 | 2.11 mm; shape: round; colour: light yellow; very slightly brownish; clarity: eye clean; cut: good; treatment: none.
Very clean, not treated specimen; good brilliant style cut. Source: David Weinberg, Multicolour Gems Ltd
More information from ‘Classification’
Most commonly refers to a blue gem variety of corundum, but other coloured varieties of corundum are also described as sapphire, except the natural red.