Sapphire — specimen 0640, photo © NMNHS
Weight: 0.20 ct; size: 4.01 | 3.46 | 2.11 mm; shape: hexagon; colour: medium light yellowish green; slightly greyish; clarity: slightly included; cut: excellent; treatment: none.
Slightly included specimen; design ‘Hexamixtum S 41-32’ [crown angle changed to 21.00], 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.