Interestingly, if you want to know whether something you own is sapphire glass, you can usually conduct a simple experiment:
Drop some water onto the glass face, and jostle the item around a bit. If the water stays put in a semi-uniform droplet, regardless of the motion and angle, it's probably sapphire.
Drop some water onto the glass face, and jostle the item around a bit. If the water stays put in a semi-uniform droplet, regardless of the motion and angle, it's probably sapphire.