This is a Native American dark blue turquoise silver ball and natural nugget 28-inch necklace. Not signed, it has a barrel screw closure. It has 93 stones separating every 3 stones with a silver bead as shown in photos.

The color is very dark, darker than most of the photos show. The first 2 photos are closest to the real dark turquoise color, but the stones are even a bit darker blue turquoise. The other photographs lightened up the true color to the lighter "normal" turquoise color. I have never seen quite this shade of turquoise and it is the most unique of any pieces I bought many years ago. It may be coated, but I am not sure. The stones are smooth. 

I am not sure if it Blue Bird Turquoise or not. Sold AS IS because I cannot remember the details from when I bought it. I just fell in love with the unique blue color. I purchased most of my jewelry directly from Navajo in the Reservation or from Todd's Attic Hogan in Prescott, AZ (before the wonderful owner died years ago).

Never exposed to smoke, perfume, scent of any kind. Put away over 30 years ago.