For this product we provide specific Pearl Necklace sizes from 27-35. Therefore we kindly ask you to measure your neck girth at the place where you want the necklace to sit. It can be either sitting at the height of the larynx or at the lowest point of the neck, the clavicle bone. Please make sure to measure it tight on the skin and then select one of the sizes with cm measurement equal to your neck measurement. To your measurement we will add afterwards some allowance to guarantee a comfortable fit. If you prefer a size outside 27-35, please select the size option MADE-TO-MEASURE and therefore we ask you to leave a note with your personal neck girth measurement (higher or lower neck as you prefer) at the checkout.