4.57ct Blue-Green Colour Octagon Cut Sapphire Certified Unheated 9.9x7.8mm Vallorbe Swiss Set Calibration can be required if

Calibration can be required if the device is transported or moved from table to table

Battery: 2 * AAA battery (not included)

Lift out tongs

Power range 100 to 240 volt (can be used either at 240 volts or 115 volts)

4.57ct Blue-Green Colour Octagon Cut Sapphire Certified Unheated 9.9x7.8mm Vallorbe Swiss Set Calibration can be required ifThis unheated sapphire is accompanied by a certificate from GIA. Sapphire is a variety of the mineral corundum, an aluminium oxide. It is typically blue but fancy coloured sapphires also occur in orange, yellow, green, brown, purple, pink, black and colourless. Red and reddish pink coloured corundum is referred to as ruby. The variety in colours is due to trace amounts of elements such as iron, titanium, chromium, copper and magnesium. Mohs Scale of