Here is a high-end Vintage Rhinestone Bib Collar Necklace from the 1960's era.  It is unsigned, but I believe it is Delizza & Elster, Juliana or another high-end brand and has many of those attributes.  This glitzy piece features prong set smoke, gray and aurora borealis rhinestones set in shiny gold finish.  Quality stones, claw-like prongs, dog tooth crimped cups, and quality plating.  In great vintage condition.  Sparkly!  No missing or darkened stones.  No finish wear to gold or foil wear.  I do not see any bad scratches or chips.  Very minimal wear.  Measures: 16" long x 1-1/8" at the widest point.  Simple hook clasp.

Thanks for looking!