Believe it or not, not many people all knows that gold replica van cleef & arpels jewelry karats, now we will introduce you the relationship between gold and karats and the application in market.
Pure or “fine” gold is described as “24 karats fine.” The karat is a standard of weight for the precious metals and gems, but it has a special significance with respect to gold. Twenty-four karats fine means that gold has no alloy whatever; but such gold is too soft for use. Twenty-two karat gold has 2 parts alloy and 22 parts gold. Old jewelry was usually of 22 karat gold. Eighteen and 14 karat gold are now much used, and the gold used in cheaper jewelry is only 10 karat gold replica van cleef & arpels bracelet, that is, more than half its weight is some other metal. As these cheaper alloys contain a larger amount of copper than the finer forms, they are easily affected by acids and have a less brilliant luster.
Jewelers have a simple method of testing the fineness of gold by the use of a hard black stone called a “touchstone.” The piece to be tested is rubbed on the stone. It leaves a little streak of metal behind, the color of which is compared with that of a streak made by gold of replica messika jewelry known quality. The touchstone method is easy but is not absolutely accurate. Gold is also tested with nitric acid.
The scientific testing of the quality of gold is done by a process of analytical chemistry called assaying. First, a very small portion of the gold is weighted in a delicate balance. Then it is wrapped in pure sheet lead and heated. The lead unites with all baser metals as it melts and this combination runs away, leaving only a lump of pure replica van cleef & arpels ring gold and silver.
This lump is weighted again to see how much base metal it had contained, after which the silver is removed with nitric acid and only the pure gold is left. The difference between the weight of this remainder and the lump containing silver determines the weight of the gold. It can be calculated to a thousandth part of a karat.
Uses of Gold
In spite of the new gold fake van cleef & arpels clover bracelet fields which have been discovered from time to time, the world has never had enough gold. The insistent demand keeps its price steady and helps to make it the standard for other values.
Gold of imitation pomellato necklace is used in dentistry, in chemical works and photography. Nearly one-half of the output is used for money. Several years ago it was estimated that in the United States 24 percent was used for jewelry, 10 percent for watch cases, 44 percent for coinage, and about 22 percent for export and for other purposes.