Hiddenite is the green gem variety of the mineral Spodumene. Spodumene is a common mineral, but only in several localities does it occur in transparent gem form. One gem form of Spodumene is Kunzite, the other important and much rarer form is Hiddenite. Hiddenite is named after William Earl Hidden, who was instrumental in identifying this new gemstone. The town in North Carolina where this gemstone was found was subsequently given the name "Hiddenite" in honor of the gemstone.
From a historical perspective, Demantoid is clearly the most important variety of the Andradite species. Demantoids from the Ural mountains of Russia were discovered in 1868. Possessing an unusual green color and a dispersion even greater than diamond, demantoid quickly became a treasured and expensive gemstone and was used by the famous Russian jeweler Faberge to create jewelry.