Interesting facts about alloys
Alloy and purity
An alloy is created by combining two or more metals in a liquid state. In jewellery manufacturing, we use the precious metals platinum (PT), gold (AU), palladium (PD), silver (AG) and copper (CU) in their clearest form. To create the alloys, these base metals are combined in various mixing ratios and melted at very high temperatures.
The acredo production works with the best-in-class principle. In our production process, we therefore first create alloys from more than 30 precious metals and cast the bullion gold bars.
We create alloys in yellow, white, grey, rose, red and green gold. Different colour shades are created by varying the mixing ratio of the base metals. We have patents for some of these alloys.
The purity describes the share of the most precious metal contained in a piece of jewellery. It is declared in thousandth parts. In the case of gold, for example, 750 /- or 18ct means that 750 of 1000 parts are gold.
Humans have been fascinated by the beauty of gold for thousands of years. Gold was already used in South-East Europe as early as around 4,000 BC, and not only was it used to create ritual objects - gold has also always been used to make coins and jewellery.
The original Indo-European word for gold “ghel” means yellow and shining. The Latin word for gold is aurum, which is also the basis for the chemical element symbol AU.
The original colour of gold is a warm yellow. This can be changed by adding silver and copper.
Gold is found in primary sources, where it is still attached to rock, or in secondary, detached deposits such as in rivers. Depending on the type of deposit, gold is won by using machines or through gold panning, which takes a lot more time. Nowadays, extraction sites for gold can be found in South Africa, Russia, North and South America, and Australia.
Rose and red gold alloys are created by adding copper. At acredo, we create white gold by adding the valuable palladium instead of the cheaper manganese, which is often used.
Classic yellow gold
Classic yellow gold has a very warm and fine radiance, as it comes closest to the original colour of gold.
Yellow gold alloys are created by adding copper and silver in nearly equal amounts. At acredo, we offer yellow gold in 585 (14 ct) and 750 (18 ct), as well as yellow gold 916 (22 ct) for wedding rings.
The more gold is included in the alloy, the richer and more intensive the colour.
White gold is available in different alloys. These differ greatly in both colour and price.
For our high acredo quality, we exclusively use the valuable palladium-white gold. This creates a natural, white-grey colour.
In contrast, manganese-white gold still has a slightly yellow colour and tends to discolour.
Rhodium plating provides jewellery made from white gold with additional protection and also makes it shine in an even brighter shade of white.
At acredo, we offer white gold in 585 (14 ct) and 750 (18 ct).
Romantic rose gold
Rose gold is created by adding a higher amount of copper to the alloy.
Jewellery in rose gold is enchanting and romantic. Its combination with white precious metals has become more and more popular over recent years.
The delicate rose gold is very flattering for the skin tones of European women, which are usually lighter.
Design the jewellery of your dreams in rose gold 585 (14 ct) or rose gold 750 (18 ct), or combine the alloy with modern white gold. Enjoy!
Red gold reminds us of fire. It is extravagant and bold.
Similar to rose gold, its special characteristics are perfectly emphasised in combination with white precious metals that accentuate the contrast.
Red gold has a particularly high copper content and is therefore particularly hard.
At acredo, we offer red gold in 585 (14 ct) and 750 (18 ct).
Palladium is a precious metal of the platinum group. Its chemical element symbol is PD. It has been known since the beginning of the 18th century and is mainly sourced in Australia, North and South America, Russia and Ethiopia. Like gold or platinum, palladium is an exchange-traded metal.
At acredo, we offer: palladium 585, which has a dark grey colour and palladium 950, which is a white alloy.
The colour of palladium with its silvery shine is very resistant. This makes palladium a true alternative to white gold.
Once you have held a platinum ring in your hands, its deep impression will never leave you. Platinum is not only rare and clear but also impressive because of its weight.
Another important characteristic of platinum (PT) is its robustness. Traces of life, which will naturally be left on a piece of jewellery worn daily, will not erode but merely shift the platinum.
We offer platinum 600 and platinum 950. There is hardly any allergy risk attached to either of these metals.
The purest of all alloys - platinum gold
Platinum gold with a 97.3% share of precious metals and 950 platinum parts is the clearest alloy currently available on the global markets.
Platinum gold (PTAU) has a fascinating character and excellent material properties. The Vickers hardness for uni-coloured wedding rings is 270 HV and 240 HV for multi-coloured rings. If the alloy is used for casting, the hardness reaches 170 HV.
Thanks to the high purity of platinum gold, its allergy potential is exceptionally low, and the alloy does not contain any allergenic substances such as cobalt.
Platinum gold stands out with its beautiful white colour. It thus provides a unique stage for the radiance of precious stones and especially diamonds.
Rhodium (RH) is a silver-white, hard metal, which was discovered in 1803. It mainly comes from South Africa, Canada and Siberia.
In the rhodium plating process, a piece of jewellery is coated with a very fine layer of rhodium. This is done in a galvanic rhodium bath using electric currents.
The rhodium plating process adds a protective coating to the jewellery, which makes it slightly more resistant. Rhodium plating also prevents discolouring. It enhances the jewellery’s natural shine.
At acredo, we use rhodium plating for jewellery and wedding rings in white gold.