A 1.5mm 14k solid gold box chain necklace, from Apples of Gold Jewelry, available in 18", 20", 24" or 30" length.
The box chain measures approximately:
18" - 6.42 grams.
20" - 7.08 grams.
24" - 8.44 grams.
30" - 10.47 grams.
Includes secure, lobster-claw clasp closure.
Also available in smaller sizes, shown below.