Blue Goldstone Crystal Egg. Goldstone is a type of glittering glass made in a low-oxygen reducing atmosphere. The finished product can take a smooth polish and be carved into beads, figurines, or other artifacts suitable for semiprecious stone, and in fact goldstone is often mistaken for or misrepresented as a natural material.
A variety of Chrysoberyl, alexandrite is pleochroic, which means it changes color depending on the angle at which it is viewed. Its color-changing property is due to an exceedingly rare combination of minerals that includes titanium, iron and chromium.