Rattlesnake is a diamond-shaped marking that goes along the body of the dragon. The diamonds may overlap and be slightly curved, so long as they look like diamonds and not triangles or circles. If diamonds are separate from the main marking, then they should still go with flow of the body. You may have up to two borders around the diamonds. They follow normal elemental rules.
All areas of the marking will have a solid, smooth border.
Rattlesnake follows regular elemental color rules.
This marking can go above or beneath other markings. It will not cover top layer markings.
Effect on Modifiers & Physical Traits
It may affect modifiers, skin, nails, ears, and similar things where it touches.
You may have ovoid shapes or circular shapes, rather than diamonds. They should still look like natural markings you would find on a snake (not perfectly circular).