Here is the sizing chart for bracelets and necklaces, along with instructions on how to measure your wrist for bracelet size:
MEASURING YOUR WRIST SIZE:
Measure your wrist with a flexible tape measurements or a strip of paper just below the wrist bone, where you would normally wear the bracelet.
If you are using a plain strip of paper, mark your size with a pen or pencil then use a ruler to measure the length. That would be your wrist size.
To find your bracelet size, refer to the appropriate measurements in the bracelet chart below.
Standard Necklace Lengths
It is important to know your neck size accurately when determining the best length for you.
To find out how to measure, refer to the instructions below.
Choker Length is 16 inches - 40 cm
Princess Length is 18 inches - 45 cm which is usually just above the collar bone.
Matinee Length is 20 inches - 50cm which usually extends below the collar bone.
Wrap a soft tape measure around your neck, keeping the tape measure parallel to the floor as you measure.
Add 2 ~ 4" ( 5~10 cm) to your neck measurement to calculate to your minimum recommended chain length. This will prevent the chain from sitting too tightly around your neck.
If you want a choker necklace, however, you can stick with your exact neck measurement instead of adding any excess length.
If you cannot customize the necklace length to your neck size, simply choose the second size up from your neck size as your minimum necklace measurement. For example, if your neck size is 17 inches (43 cm), your minimum standard should be should be 20 inches instead of 18 inches (45 cm).