Do you mean that when you mine diamond ore (stone with blue dots), it doesn't drop diamond. If that's the case, then you mined it with the wrong tool.
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You will need an Iron Pickaxe (or better).If you mine it with a wood/stone pickaxe it will break and give you nothing.
Minecraft beta is not free, you have to pay to play it. Any website attempting to give you Minecraft for free is illegal. If you find a site like this do not download anything from it as it is not only illegal, but may contain viruses.
all you have to do is get a zombie, or skeleton, or zombie pigman, and then give them a steve head. also you could give them clothes to look nice. the clothes dont have to look like steve clothes.
no they don't give viruses
The efficiency of a pickaxe in minecraft is the speed at which the pickaxe can mine materials.