These earrings are made with medium-bright-blue gem silica from the Inspiration Mine in Arizona. This is the top grade gem silica in terms of color and purity of material.
They are constructed of solid 18k gold with delicate details around the bezel. Each earring is approximately 5/16” wide and 7/16″ tall (to the top of the ring that attaches to the ear wire).
Learn more about gem silica at this link.