A Lovely Vintage Modernist Sterling Silver Blue Rhinestones Enamel Collar Necklace. The item is stamped 925 as shown. On my scale it weighs 34 grams give or take. It's about 18" to 16" long. There is an imperceptible missing enamel on the center as shown.  Or else the item is in good condition.

Thank you and have a great day!