Pietra grezza da sfaccettare - Zaffiro verde acqua / blu acciaio Czochralski (tirato) coltivato in laboratorio 13.9-16.5ct

Lab-created Sapphire 
Growing method: Czochralski
Czochralski, or another name Pulled, process carries the same physical and chemical properties as natural sapphires.
Advantages of the Czochralski method: the method allows to grow a bigger size and better clarity crystals that rarely can be found in nature. Comparing to flame fusion method, crystals grown by Czochralski method almost don't have air bubbles.

Color: grayish Teal Montana (along c-axis), Steel Blue Montana (across c-axis)
Clarity: loupe clear
Size: L13.2-13.8 x W8.7-9.2 x H16.7-6.9mm 
Weight: 13.9-16.5 ct

Formula    Al2O3
Mohs Hardness    9.0 (Mohs)
Crystal system    Trigonal
Refractive Index    1.757 - 1.779
Specific gravity    3.95–4.10 

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