Although the color of the snake varies from yellowish gray to pinkish or pale blue, identifying the diamondback rattlesnake is easy. You just need to know the look of the scales, the head, and the tail. It has a diamond design on its back with a white border that runs from its head up to its tail. It has a rattle that has jet black rings. It is a venomous snake. A diamondback can run a length of up to 8.5 feet.