There Are rules that apply to all the heraldry in general. Armory always obey the rules that govern them.

Laws Heraldry:

First Act .- never should be on the metal shields on metal or color on color.

Is not accepted that, for example, on a gold shield, put on a figure, which is also gold.
The exception to the Armory to be the "enquerre" (those that contradict the rule of heraldry is not never put color on color or metal on metal).
An example of a serious violation of the rule, the arms crossed, conqueror of Jerusalem, Godfrey of Bouillon belong to the class of "enquerre" and wearing a silver cross and gold power, cantonada four cross of gold.

Second Law - The shapes of the Armory itself should always be placed in their rightful place, not made "without order or concert."

Third Law - The shields in the figures that appear natural, artificial or chimerical, if several of these figures may be placed one over another, but it is only when one is put right in the center of the shield, regardless of size, but filled the entire field, but without touching the edges.

Fourth Law .- In the case of the figures that are not honorable, and there are pieces on the shield in number three, get two in chief and a tip.