Yellow Gold

Gold is rarely used as pure, pure "fine gold". 

On the one hand this is because fine gold is relatively soft and is hardly suitable for jewellery that is to be worn every day, on the other hand it is not only a question of cost, but also of taste, because with the help of the additional metals in a gold alloy, one can influence the colour tone. 

The fact is: gold, the element and pure metal, is always yellow! There is NO white, grey or red gold! 

In this article I would first like to deal with the so-called yellow gold. 

A yellow gold alloy is an alloy that should normally consist of gold, silver and copper.
This mixture should preserve the natural golden colour of the gold as far as possible. Therefore the alloy partners consist of the light silver and the red copper. 

Copper and gold are by the way the only two non-grey metals! 

Additives like tin instead of silver have no place in gold jewellery!
Tin is a base metal and can react aggressively with the skin.
In addition, it leads to embrittlement of the material and can make repairs or changes almost impossible. 

Here is an overview of the various yellow gold alloys: 

750/- yellow gold (18 ct.) is of particularly high quality.
It can be forged wonderfully and hardened particularly well. It is particularly suitable for more complex pieces of jewellery and has a particularly beautiful, warm gold tone. 
Vickers hardness: approx. 140-215 

585/- Yellow gold (14 ct.) is the most common jewellery alloy. It combines good metallurgical properties with a lower price. 585/- is also easy to forge and process.
The gold tone is somewhat lighter than that of a 750/- alloy. 
Hardness according to Vickers: approx. 170 -250 

333/- Yellow gold (8 ct.)is not recommended.
It is very brittle and prone to stress corrosion cracking. 
In addition, 333/-gold tends to tarnish due to the high amount of copper. 
It has the worst price/performance ratio as it is difficult to process but contains very little gold. 
Some old alloys, or goods manufactured abroad, contain a high proportion of tin instead of silver, which can not only lead to deflections in the carrier, but also significantly reduce the value of the material. 
Precious brass - the goldsmith would say.
Hardness according to Vickers: approx. 105-230

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