This measures 19 1/2" including the clasp.  The clasp is marked 925.  It is strung on wire.  

I believe this is turquoise & coral.  I did do some poking around online and someone suggested that I do a nail polish remover test to make sure it isn't dyed howlite.  I did this on a bead and no color came off.  I also did try to scratch the beads and they were solid.  

There are some imperfections to the stones.  Please look at the pictures. 

I am happy to answer any questions.

Thanks