noble metal people met in the old days.This is evidenced by the excavations of ancient tombs in Egypt, Spain and the Caucasus.Noble metals gold was named because of its unique ability to shine and does not oxidize when exposed to air.
magnetism of gold a legend, can not do without him, and in fairy tales.What kind of precious metal, and what it is?Soft and ductile, expensive and incredibly beautiful - these gold properties familiar to every schoolchild.But the fact that every time this gave rise to a kind of noble metal know more specialists.Besides the usual colors - yellow, gold was black and white, red, blue and green, but the last two by modern jewelers are too fragile because their own are not used.
White gold, the composition of which is not very complicated, got very popular in the 30s of the last century.Precious stones have always demanded an expensive frame, this is perfectly normal yellow gold, but for diamonds and pearls needed something special.Then the question arose about the possibility to lighten the gold.It is believed that only white-rimmed diamond is able to start playing at full strength.In addition, jewelry is the perfect decoration for any outfit, but if the stones will surround the white gold, the composition of which is required to find out.
What people used to lighten the precious metal?Initially it was silver were then used additives nickel, zinc and copper.From the percentage of gold and ligatures (above metals) depended on its hue.Most often, it was yellowish.But the bluish glow of the product acquired, when it was part of the gold alloys with platinum or other precious metals of the platinum series - palladium.
Platinum is known to mankind since the sixteenth century.At first, the metal nobody paid attention (in Spanish means "serebrishko").But today everyone knows that platinum is much more valuable than gold.This explains the lack of retail jewelery, where the stones served as a frame for the noble white gold, an alloy which must be at least eighteen percent of platinum or palladium.The price of such products has grown significantly, making jewelery making unprofitable.Exceptions are exclusive items made to order.The same as we see in the windows of our stores - it's (usually) an alloy containing nickel, is not the most harmless to the human body element of the periodic table.Its price is much lower - it is a decisive factor in the manufacture of jewelry.But we must remember that the white gold, the composition of which includes twelve percent nickel, can cause all sorts of skin irritation and even allergic reactions.
Trial white gold depends on the percentage of gold and ligatures.One gram of alloy 375 samples, for example, contains only 37.5 percent ownership of gold, everything else - additives.Of course, the price of such products is low, and it is already considered the jewelry will not.This is just jewelry, dim in the air.
Platinum and palladium white gold lend a noble shade, and other impurities, as mentioned above, making it dimmer.In order to make products shine, jewelers use a process rodirovki.Precious jewelery is covered by a thin layer of rhodium, platinum metal from the series, beautifully reflects light and adds shine, which gives the product of white gold status of exclusivity and elitism.However, if over time favorite decoration lost original form, do not despair.Thinned coating can be restored in the jewelry workshop, where precious little thing will have recovered their former beauty, and you - a wonderful mood.
