I had the Apple Silicone case on the phone when the screen protector cracked. No damage to the case.Yeah sapphire is easily cracked. Were you caseless? I had the IMOs sapphire which is thicker than the Shellrus but it took a hard fall and popped out the Apple leather case and chipped a bit. Went with Shellrus as a replacement since I kinda hated the IMOs logo being visible with the screen off