What's the difference between diamond and regular push ups?

I do both regularly, I've been told that diamond push ups work the triceps and lower pectorals and regular push ups work the upper chest and shoulders more.|||what happens in pushups normally is that your hands are about shoulder width apart. This helps your outer chest more(toward arm-pits). It also helps your shoulders toward the front. Diamond places hands closer together which makes you contract more the inner chest, toward center. It does also work triceps a bit more depending on your form. With a good form you might even feel it in the back or your neck.