This vintage rose gold collar is heavy and solid. The links are a weaved herringbone style.  
 
A new necklace of comparable weight and size would sell for $7,400.  
Dimensions: 7.4 mm wide x 3.6 mm thick / 10 x 5.5 mm at clasp
Metal: 14k Rose Gold
Clasp: box clasp with safety "8" catch
Markings: 14K PAT. 4697315
Length: 16.5" 
Weight: 66.9 grams
Condition:  8 (well loved, shows light scratches)
 
Thanks for looking!!!