Collier en argent, agates, topazes et pierres de lune

Topaz : Topaz is a silicate mineral of aluminium. Imperial topaz is yellow, pink (rare, if natural) or pink-orange. Brazilian Imperial Topaz can often have a bright yellow to deep golden brown hue, sometimes even violet. Many brown or pale topazes are treated to make them bright yellow, gold, pink or violet colored. Naturally occurring blue topaz is quite rare. Typically, colorless, gray or pale yellow and blue material is heat treated and irradiated to produce a more desired darker blue.
Chalcedony : Chalcedony is a family of cryptocrystalline silica gems. Varieties of Chalcedony used in jewelry are for instance Agate, Aventurine, Carnelian, Chrysoprase, Heliotrope or Onyx.