Vintage Fred Davis sterling silver necklace with cabochon set amethysts. The stones are set into repousse discs in a stylized sunrise pattern. There are 20 discs and amethyst stones connected by chain links.
Box clasp closure. 
This is a legitimate Fred Davis piece, made in Taxco Mexico.  Pre 1948. 

HALLMARK/LABEL: FD Mexico Sterling, Eagle 22.

PROVENANCE: The Collection of Cindy Tietze-Hodosh and Stuart Hodosh.

MEASUREMENTS: 15 1/2" wearable length, 16" to the end of the clap, end to end
discs approx 5/8" x 5/8".