14K Yellow Gold adjustable rolo cable chain necklace with a 1.0mm width, 20" length, lobster clasp, and approximate weight of 1.66 grams.
 
Specs:
Metal/Material: 14K Yellow Gold
Width: 1.0mm
Length: 20 inches
Clasp Type: Lobster Clasp
Approximate Weight: 1.66 grams
Stamp: 14K