Difference between white gold and yellow gold
White gold vs yellow gold:
While pure gold is yellow in colour, coloured gold can be developed into various colours. These colours are generally obtained by alloying gold with other elements in various proportions. Coloured gold can be classified to three groups. They are, the Au-Ag-Cu system, producing white, yellow, green and red gold; typically malleable alloys, the intermetallic compounds, producing blue and purple gold, as well as other colours. These are typically brittle but can be used as gems and inlays and the surface oxide layers, such as black gold; mechanical properties depend on the bulk alloy, and the coloured surface is prone to wear. Among these coloured gold, white gold and yellow gold are often used and often confused as well. Therefore, this article aims at providing knowledge on the differences between white gold and yellow gold.
What is white gold?
White gold is a popular alternative to yellow gold, silver or platinum. While white gold contains varying amounts of gold, which is always yellow, it also contains one or more white metals to lighten its colour and add strength and durability. The most common white metals that form the white gold alloy are nickel, palladium, platinum and manganese. Sometimes copper, zinc or silver are added. The properties of white gold, including its colour, depend on its composition. Although most people think white gold is a shiny white metal, that colour is actually from the rhodium metal plating that is applied to all white gold jewellery. Without the rhodium coating, white gold might be grey, dull brown or even pale pink. Manufacturers grade white gold in karats, based on the percentage of gold in the piece, the same way they grade yellow gold. While yellow gold of different karats may differ in colour, white gold of 10kt, 14kt, and 18kt usually looks the same because of the rhodium plating. It will, however, differ in hardness, with 10kt as the hardest. 18-karat gold is the softest. It contains the most pure gold and is, therefore, the most expensive. By law, every piece of gold jewellery bears a stamp declaring its weight in karats. About one out of eight people has an allergic reaction to the nickel in some white gold alloys when worn over long periods. A typical reaction is a minor skin rash. Because of this, many European countries do not use nickel white gold. White gold alloys made without nickel are less likely to be allergenic.
What s yellow gold?
Yellow gold is pure gold mixed with alloys. The alloys used are mainly copper, and silver. Zinc and nickel may also be used as alloys of the same. Gold is a metallic element with the atomic number 79 and the symbol Au. While the name gold comes from an Old English word meaning yellow, the symbol comes from the Latin aurum, which means “shining dawn.” Gold is the most popular choice for men’s and ladies wedding rings and engagement rings. Gold is also very popular in dress rings, earrings, pendants, necklaces and bracelets. Although many people many know gold for its use in jewellery — which is how about 65 per cent of it is used — it has a number of other uses. About 25 per cent is used in industrial applications in ceramics, electrical, and electronics applications. Gold is found in both lode deposits and placer deposits, and is naturally uncombined. While the largest deposit is to be found in South Africa, deposits of note are also located in Australia, the former Soviet Union, and a number of western states of the United States, including Arizona in the Southwest; California, Montana, and Washington in the Pacific Northwest; and South Dakota in the Midwest. High quality pure metallic gold is tasteless and scentless, in keeping with its resistance to corrosion. Gold is the most malleable and ductile of all metals; a single gram can be beaten into a sheet of 1 square meter, or an ounce into 300 square feet. Gold leaf can be beaten thin enough to become transparent. The transmitted light appears greenish blue, because gold strongly reflects yellow and red.
What is the difference between yellow gold and white gold?
An 18-karat white gold ring contains the same amount of gold as an 18-karat yellow gold ring: 75 per cent pure gold. The difference in the colour comes from the different metal alloys with which the gold is mixed before its use. Both yellow and white gold may contain the same amount of pure gold. The main reason why the colour becomes different is with the type of metal alloy mixed to it before use. While white gold is usually alloyed with nickel, yellow gold uses silver as an alloy. Both white and yellow gold are composed of 58.3 per cent pure gold and the rest is the matched alloy. Both white and yellow gold also use zinc and copper as alloys. White gold is also more durable and scratch resistant than yellow gold, thanks to the stronger alloys with which it is paired. However, white gold is still lightweight and soft enough for jewellers to work with. White gold rings are easy to re-size if necessary. Yellow gold needs to be polished frequently to retain its shine, and it is softer than white gold, and thus more vulnerable to scratches and marks. Because of the types of alloy mixed with white gold, it is generally more durable and more expensive than the yellow gold.
The yellow gold is much more prone to scratches. But since white gold has a natural faded colour, it needs to be coated once a year with rhodium for it to have a shiny silvery look. White gold is becoming a more popular choice for consumers today, but the classic yellow gold is not going anywhere. White gold is a favourite to go with diamonds and other stones since it highlights them better. The yellow gold could reflect a yellow tint to a stone. The chance of allergic reactions to the alloys used in yellow gold is much lower (about 20 percent of the population is allergic to nickel in white gold, whereas zinc or copper allergies are rare) than that of white gold.
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