A 10k solid gold 1mm wide box chain necklace, from Apples of Gold Jewelry, available in 16", 18", 20" or 24" lengths.
Includes an industry-standard, secure lobster-claw clasp.
Each 10k gold 1mm box chain necklace weighs approx.:
16" - 2.47 grams
18" - 2.82 grams
20" - 3.12 grams
24" - 3.73 grams
Also available in 0.7 or 0.9mm, shown below.