3 mm antique brass beads are crocheted onto brown silk cord.  The necklace is 22 inches with a beautiful antique brass and emerald green pendant that adds an additional 3 inches. 
I used an antique brass button, from my mama's vintage button stash.
 

Black Chinese Silk, hand crocheted with 3mm genuine Turquoise Gemstone beads.  A large Turquoise Nugget finishes the look to secure the necklace.  The large Navajo like pendant has a turquoise stone in the center.  (I am not sure that it is genuine though).  The pendant is removable so you can just wear the necklace as is and/or add the pendant to a silver chain.  Lots of choices!  I wore it today and got lots of compliments.