well...it depends on what part of the country or world you are living in....if you are outside the united states, i have no idea. i assume yo are within the u.s. so most likely, the snake you are inquiring about is a type of rat snake. they actually vary somewhat in color, so without a pic, noone can be sure.
diamondback rattlesnakes also have diamonds on their back. they are usually a browner color but i can only assume anyone would recognize the rattles on any rattlesnake.
you may look up a pictorial directory for snakes in your area by preforming a search on Google or Yahoo.
There are several different types of snakes that can be black with white or gray diamonds on them. The possibilities include a California king snake or a black rat snake. Both are non poisonous.
A diamond snakes
Arizona black rattlesnake
rattlesnake
Black Snake Diamond Röle was created in 1981.
if it has a diamond shape head it is poisonous
if it has a rattle then its a diamond back rattle snake. i don't know where you are but those are found in Arizona and other states near by. diamond back rattle snakes are extremely venomous and you should stay away from them.
what does a white snake with black diamonds on the back mean
yes, young Mexican Black snakes will often have silver or white bellys.
That is the endangered Georgia Tube snake.
it lives in North America that's where the diamond black rattle snake lives.
Diamondback rattlesnake
Lots of snakes are brown and black. You'd need to be more specific about the patterning, size, head shape, and location you spotted the snake to get a good answer.
king cobra
Are you saying that the snake has like a "hood" around the head? If so, that is a cobra.
Depending on where you live, there can be many types of snakes with these similar patterns. The most common types would be certain kinds of Garter snakes or juvinile Black Racers. Rattlesnakes can also have this type of pattern.