Real stone?

I recently purchased this piece don’t know too much about it only that she stated it was a natural stone two inches long and about 1 1/2 inches wide pretty substantial in weight
Any feedback appreciated No markings

It appears to Navajo made bracelet and I do not see anything that suggests that is not a natural stone. Looks like it has some age, maybe 1970-80s, has a little bit of a Ramone Platero look.