You are buying a Figaro Lightweight Chain Necklace 10K Yellow Gold. The necklace weighs 7 grams of 10k yellow gold, 22" long, ~4.4 mm wide, ~1.2 mm thick. The clasp is stamped "10kt". ~The necklace can be seen in person at Exquisite Jewelers in Palatine, IL 8 47 202 7889~.
eBay