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Sapphire Indelible Lead 725 by Eberhard Faber Pencil Co.

 
   

Pencil details

Brand: Eberhard Faber Pencil Co.

Type: Colored Indelible

Made in: USA

Interesting note:

Sapphire is a gemstone variety of the mineral corundum, an aluminium oxide (α-Al2O3), when it is a color other than red, in which case the gem would instead be a ruby. Trace amounts of other elements such as iron, titanium, or chromium can give corundum blue, yellow, pink, purple, orange, or greenish color. Pink-orange corundum are also sapphires, but are instead called padparadscha