All you should know before buying a jewelry made with platinum.
Gold or platinum? When you buy a ring, or more rarely, earrings or necklace, you can often choose between the classic white gold and platinum: look similar, but there are differences, even in the price. Here’s what you need to know about platinum.
Because it costs more. Platinum is a precious metal rather rare: is located in the sand, mixed with gold, or together with other metals. The problem is that in order to isolate must be a long process. And to say that the name comes from the Spanish word plata, indicating the silver, a much more common metal.
Features. Platinum is naturally white, and gold harder and durable, but is also heavier by 30% compared to the yellow metal. Of course, for a ring the extra weight is not felt. The platinum is not shiny as silver, on the other hand its color resists in time, it does not need to be plated or mixed alloy with other metals, as is the case for the pink or white gold. For this is very much appreciated for rings, a type of jewelry that suffers the wear of time, because it is easier to become moldy.
The weak points. Although it is a very durable metal, it is said that platinum is eternal. It is true, it does not oxidize, ie does not become black on contact with the air, but can however be corroded by cyanides, halogens, sulfur, and caustic alkali, such as soda. The platinum is not dissolved in hydrochloric acid or in nitric acid, but is corroded with the mixture of these two elements is the liquid substance that is used as a solvent for the enamels. Avoided, in short, to paint a mobile wearing a platinum ring.
What to check. There are several different types of platinum according to the purity: the marks 850, 900, 950 and 999 refer to the number of parts of platinum for every one thousand. The one most widely used in jewelry is platinum 950, but is not required to report it as is the case for gold. If you want to know how much is pure platinum that you want to buy, so you have to ask.