Stones On Necklace

Any suggestions on the type of stones?
Thanks

 

The long curvy ones are a kind of shell...dentalium, I think. Sometimes used by Native Americans in the Western or Northwest US and Canada.
The central stone looks like (maybe) some type of jade, or one of the stones commonly called jade....and could also be from the NW (as in "BC jade")...but there are other possibilities and I'm sure folks will offer some of them.

 

Thanks. Never heard of that shell but it does look to be dentalium.

 

The darker green stone appears to be a marbled jade.

 

What is marbled jade? Not a true jade I guess.

 

I could be wrong, but I believe "marbled jade" would refer to a pattern in the jade, rather than being a different mineral.
"Jade is a commercial term encompassing green, white, black or yellow-brown jadeite and nephrite. Jadeite is a rock that consists essentially of jadeite (sodium-rich, high-pressure pyroxene), whereas nephrite consists of prismatic to acicular amphiboles of the tremolite-actinolite series forming bundles that are randomly oriented and interlocked."
(From BC government site).
Nephrite jade is more common than jadeite; all the jade found in British Columbia is nephrite, and BC produces about 75% of the world's supply of nephrite.
The stone pictured looks to me like nephrite jade, quite similar to some pieces I've seen from BC.