This is an 18k solid gold ring with a piece of medium-green chrysoprase from the Marlborough mine in Queensland, Australia. The design is a simple one with twisted wire around the bezel and twisted wire around the band. The setting is accented with a few tiny gold balls.
The ring at its widest point is a little over 3/8” wide (at the front – top to bottom) and the band is approx. 1/8” wide at the back.
Learn more about chrysoprase at this link.