Interesting & Signed but I have no idea whose mark it might be?  Even on close inspection under magnification, the mark is hard to identify.  The letters look to be NATURAL in script -- no guarantee on this however.
24" Beaded Necklace & 2 1/4" Silver Fish Pendant 
Turquoise - Lapis - Crystal - Long tubes look like bone or horn & definitely not plastic.
All metal is not magnetic except for clasp.
Probably Asian or Native American