Measure your size
Ring
With existing ring:
Measure the diameter of the existing ring
New ring
Find a slice of paper or a rope
Loop it around your finger and find the size you want
measure the length of the rope with the preferred size
Bracelet
With existing ring:
Find a slice of paper or a rope
Measure the perimeter of the existing bracelet
New ring:
Find a slice of paper or a rope
Loop it around your wrist and find the size you want
measure the length of the rope with the preferred size
Necklace
With existing necklace:
Find a slice of paper or a rope
Measure the length of the existing necklace
New necklace:
Find a slice of paper or a rope
Loop it around your neck and find the size you want
measure the length of the rope with the preferred size