The best way to indicate which size to purchase is by measuring a ring you already own using a standard ruler.
Measure the inside of the ring from one side to the other in millimeters, this is your ring's 'inside diameter' - now that you have this you can use our sizing chart below.
Rings with thinner bands tend to run a bit larger, whereas a wider banned ring has a more snug fit. The more metal around your finger, the more space it takes up and the tighter it fits, ie: a thin size 6 ring will fit larger than a wide size 6.
NOSE RING DIAMETER (INTERNAL DIAMETER)
NOSE RING GAUGE (THICKNESS OF WIRE)
TYPES OF EAR PIERCINGS