925/000 silver Markasite set with Australian Jade (pendant, ring & earrings) from Prestige.

Jade is the common name for two minerals used as gemstones: jadeite and nephrite. In the economic circuit is also nepjade. This is worth less than genuine jade. One can distinguish the two from each other by real jade in a long period of time changes color as the years has been in contact with human skin. Jade has many different colors: green, brown, black or wolkenwit, from very light to very dark. Jade is like soapstone and chalcedony been cut and edited thousands of years by the Chinese. Jade was originally used as a tool but came during the Han Dynasty in vogue as jewelry. The only place where nephrite found in China located in Sinkiang around the city of Khotan. In Chinese culture is only processed jade seen as valuable. A lump of raw jade is of lesser value. In Sanzijing is listed as a comparison with education: "If one does not polishing jade, it is not costly thing if a man does not learn, his life has no meaning, because he knows the norms, values and respect for life is not. and thus will never be accomplished "(玉不琢不成器 人 不 學 不知 義). Jade is considered a valuable stone that wards off evil forces. When carried a long piece of jade on his body, for example a piece of thread around the neck, one will see that the jade slowly changes color. During the 2008 Olympics in Beijing, the medals feature jade.

The mineral marcasite or spear choose a pale yellow to source tinwit iron sulphide with the chemical formula FeS2. The name is derived from the Arabic word Makraschit, the original name for pyrite and similar minerals. Marcasite is rarely recognized as a gemstone, but in the Middle Ages especially popular in France, and was used as folk jewelry. Nowadays, especially in Thailand put small cut markasieten in silver. In prehistoric times it was used as a fire starter in combination with flint. Hydrothermal, postvulkanisch, not hyper and sediments. Marcasite has the same chemical formula as the cubic pyrite but a different crystal structure (orthorhombic). This called wordtisomorf. Marcasite is to the air quickly darkens and copies of this mineral can, over time even crumble or disintegrate. It is unimportant as iron or sulfur ore mineral. In the gems trade name marcasite is used improperly to cut pyrite. This "marcasite" with a brass-yellow color and a high gloss metal is mainly in silver jewelry put the entourage material. The name marcasite is Arabic or Moorish origins. It was used for all pyrietachtige minerals as marcasite, chalcopyrite, sphalerite and other. Marcasite hydrothermal is usually formed, and is found in sedimentary rocks (such as limestone, shale ofligniet), or in veins (with zinc and lead sulphide). The formation of marcasite occurs at low temperatures and under reducing conditions. It is found in the chalk deposits as at Cap Blanc-Nez near Calais, France. Sensitive to heat and sweat, fire comes into sulfur dioxide. The mineral to the surface corrodes