have been used for eons to bring the energies of the mineral to the wearer.  In Victorian age, minerals were used in pendants to spell names and or to spell words for protection, charms, and enchantments.  The first letter of the mineral was equal to the first letter of the name or word spelled - for example to wear Amie, the first mineral  with an "A" like amethyst followed by moldavite, iolite and emerald.  This is a very unique way to bring the numerical vibrations to ones being and to enhance ones energy field.