This seamless ring is made from sterling silver, yellow gold plated silver, or rose gold plated sterling silver.
The entire seamless ring measures approximately 17mm tall by 14mm wide for the 5/16" diameter, and 19mm tall by 14mm wide for the 3/8" diameter.
When opening seam rings for insertion it is best to twist the two ends away from each other, rather than opening the ring as one would do with a standard captive bead ring. The second method will distort the shape of the ring.