Sapphire — specimen 0505, photo © NMNHS
Weight: 0.11 ct; size: 2.94 | 2.93 | 1.73 mm; shape: octagon; colour: medium light very slightly greenish blue; very slightly greyish; clarity: eye clean; cut: excellent; treatment: heating.
Very clean specimen; design ‘Eight’ by Glenn & Martha Vargas, excellent cut by Tan Pen.
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.