There are two ways to unlock diamond camo. The first is to complete all camo unlocks in a class of weapons, for example if I wanted a diamond ballistic knife I would have to get all the camo unlocks for the ballistic knife and the assault shield because their in the same class (Specials). The second way is to reach prestige master, when you reach the maximum level at 10th prestige they will give you all weapons, their respective camos and unlocks, equipment, perks, wildcards, emblems, and calling cards are automatically and permanently unlocked.
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You unlock gold camo in black ops, when you reach prestige level 14, level 25.
its available when you get the mkII
i believe there are 15 prestige levels in call of duty black ops.once compeleted 15th prestige you will unlock gold camo for all of your weapons.
Get to 14th prestige, and then buy the gold camo for 50,000 COD points from the camo list.
you can change your gun camo and your camo on your person.