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Is it a pure substance or a mixture?

I have three things and I need some help classifying them. I think they are all pure substances.Diamond? Milk? And, copper metal?
Penny:

diamond is a substance based off of coal so it is a pure substance, milk is not a pure substance it it contains alot of differnt elements and materials,and copper is a pure substance as its a natural mineral

Colder:

Diamond is pure, copper metal is pure while milk is not pure.

Melly:

Diamond is made of only the element carbon.
Copper is also an element.
Milk has water, many proteins, and a mixture of who-knows-what.

Answer:
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