How to Measure a Necklace
Step 1: you could also wrap a soft tape measure around your neck.
Step 2 :Keeping the tape measure parallel to the floor as your measure.
Step 3: Then, add 2 to 4 inches (5 to 10cm) to your neck measurement to calculate your maximum recommended chain length
Refer to the image below to get an idea of what the length of your necklace may be on you