However, the noblest variety of chalcedony is truly Polish – very beautiful stone, apple green, light color – chrysopraz.

Large clusters of this stone occur in the vicinity and in the nickel mine "Marta” in Szklary and in the vicinity of Jordanów, where the existence of a deposit with a length of approx 30 km. There are only four other sites of chrysoprase occurrence in the entire globe. These are small deposits of the Middle Urals, The Nickel Mountains in Oregon and a small amount in California, United States, The only significant competitor to the Lower Silesian chrysoprases may be found in 1961 r. the Marlborough Creek field in Australia, but apparently our Polish chrysoprase is the most beautiful in the world.

Colored with hydrous magnesium and nickel silicate, in which nickel is a coloring metal, chrysoprase was mined on an industrial scale in Lower Silesia from 1740 year. Valued for its beautiful color, hardness, and most of all rarity, aroused the desire of the richest people in Europe. Fashion for jewelry, ornaments, mozaiki, and even chrysoprase furniture has dominated Europe for many years. Frederick the Great wished to decorate the so-called stone with this stone. chrysoprase hall at the Sanssouci Palace in Potsdam. This stone is used to make a mosaic in the chapel of St.. Wenceslas in Prague. He was valued so highly, that it was embedded in rings, brooches and other jewelry decorations in a central place, and around it, diamonds were framed to emphasize the beauty of chrysoprase reflected from their surface. Later the fashion passed, and chrysoprase was so forgotten, that one of the roads in Szklary was paved with it. Today it returns to favor, it becomes a jewelery material again. Chrysopraz (from Greek golden-green) can be our Polish, Lower Silesian "gold”.