peridot is gem-quality olivine and a silicate mineral. its green color is affiliate on the iron contents within the structure of the gem. the molecular structure of peridot consist of isomorphic olivine, silicate, magnesium and iron in an orthorhombic crystal system.
alexandrite is the highly regarded color changing variety of chrysoberyl. the color of alexandrite changes under different lighting conditions. if viewed in daylight, its color is greenish blue to dark yellow-green.
Amber is a fossilized tree resin that has been appreciated for its color and natural beauty since Neolithic times. Much valued from antiquity to the present as a gemstone, amber is made into a variety of decorative objects.