Made with solid 14k gold.
On the 16g 5/16" diameter the rings are 18g 1/4" and 16g 5/16".
On the 16g 3/8" diameter the rings are 18g 5/16" and 16g 3/8".
On the 14g 5/16" diameter the rings are 16g 1/4" and 14g 5/16".
On the 14g 3/8" diameter the rings are 16g 5/16 and 14g 3/8".