I've chipped a diamond bit. It was actually a Hudy one! Under normal and proper use, a diamond bit will not chip. My second bit is a cheaper off brand one, lasted for years and still cuts like it did on day one! Theres no "easy to chip brand" that suck. How I did it?, pure stupidity. If you accidently feed the bit right into the shunt like I did, any bit from any brand will chip. You drop a diamond bit onto concrete floor off a table, any brand bit will chip! If your bit only ever touched the copper on a comm and cutting oil, it's never gonna chip on you for no reason!