Interchangeable ring
These adjustable rings excist in 2 sizes, 16mm (CC200-16) and 19mm (CC200-19; with both rings you can wear from 15 to 23 mm. With the 3 tops you can match the ring with your interchangeable pendant but only the ring is beautiful too.
The glass bead must have a minimum hole of 4 mm but if the hole is smaller then you can use the end bead Salak to keep the bead in place (diameter of the pin is 1,9 mm). The useable length is 8 mm, if the bead is thinner then you can use a silicon ring underneath the bead to fill up the space.