Total internal reflection occurs when a wave (such as light) reaches a medium boundary at an angle of incidence greater than the critical angle within a medium of higher refractive index.

1: Diamond to Glass: Correct. Diamond has a higher refractive index than glass. This means light can move from diamond to glass at an angle greater than the critical angle and experience total internal reflection.

2: Water to Glass: Incorrect. Glass has a higher refractive index than water, light cannot experience total internal reflection moving from water to glass.

3: Air to Water: Incorrect. Water has a higher refractive index than air, so light moving from air to water cannot experience total internal reflection.

4: Air to Glass: Incorrect. Glass has a higher refractive index than air, so light moving from air to glass cannot experience total internal reflection.

Hence, the only correct option is from diamond to glass.