” Included: a green aventurine specimen

This bypass ring sets a round turquoise cabochon—copper aluminum phosphate

much of it from the Andes of Peru

The stone's transparency and color intensity vary with manganese concentration

Chrysoprase was used in jewelry by the Egyptians

Pink Thulite Sterling Silver Pendant Peridot ” Included: a green aventurineA pink that is geological, not dyedmanganese in the crystal structure of a Norwegian zoisite. Thulite is a pink variety of zoisite (Ca2Al3(SiO4)3(OH)), a calcium aluminum sorosilicate, its color produced by manganese substituting for calcium in the crystal lattice. The stone was first formally described in Norway in 1820 and named for Thule, the ancient Norse and classical concept of a northern land at the edge of the known world. This oval cabochon