How are agate stones formed? Agates are formed when gas bubbles in lava leave a hole in the "vesicle" in the rock, according to the Michigan Department of Environment, Great Lakes, and Energy.

How do I know my stone is an agate? "Agates are sometimes hard to identify, even for the experts," Mary Ann St. Antoine, a senior environmental quality analyst in the Marquette District Office of ...

Mendes "Havana" style is made with the gemstones chrysoprase, emerald pavé and white agate, as well as diamond accents and set in 18-karat reclaimed gold. The design retails for $9,750.

How do I know my stone is an agate? "Agates are sometimes hard to identify, even for the experts," Mary Ann St. Antoine, a senior environmental quality analyst in the Marquette District Office of ...