For the jewelry industry, 18-carat gold is the most appreciated, its great virtue, the balance of its content, it has excellent resistance and sparkles, tolerating constant use over the years; heThe casting of gold and its shades are processes that have been perfected over timeeach house has its formula and combination to achieve the transformation of pure gold, the alloys are what provide the shades of gold jewelry to obtain beautiful pieces.
In order for gold to be purified, it must undergo a smelting process, it must be remembered that the metal naturally extracted from the earth contains impurities and traces of other metals, in order to remove them a procedure is applied that is based on the use of chemicals, high temperatures and high pressure, to remove these minerals and impurities.
To separate the ordinary matter that is fused to the gold ore, the ore must be pulverized or pressed, then placed in a furnace at temperatures above 1064 degrees Celsius, raising the gold above its melting point, so that the impurities disappear. , in this first step of the smelting process, it is possible to separate the gold from the other metals, introducing solutions of mercury or cyanide, generating a reaction in which the gold coagulates forming nuggets and gold lumps.
Once the pure gold is separated, it is melted again by pouring it into molds to form ingots, where part of this gold will be used for the jewelry industry; pure gold is yellow in color and the shades are generally obtained by alloying gold with other elements In different proportions, yellow gold is the most common color in jewelry pieces, but it is also possible to achieve other colors such as white, pink, green, red, gray, blue and black gold.
For white gold, an alloy is produced that has as components, yellow gold and other platinum group metals, the most used is palladium, others are: platinum, rhodium, osmium and iridium; The bright white color that results from this transformation is used to set gems and create eye-catching pieces with chromatic combinations with gold of other colors.
Rose and red gold is an alloy of gold and copper, widely used in jewelry, the difference resulting from red and pink is given by the copper contentFor this reason, it cannot be said that red gold is an 18-karat formulation because it needs at least 50% copper for its alloy.
Blue gold is an alloy of gold and indium, gray gold with an alloy of silver, manganese and copper, in specific proportions for gold, and black gold can be produced by electroplating using black rhodium or black ruthenium. Human nature induces us to look for variety and novelty, which is why today we see beautiful designs that escape the traditional without losing their elegance.