Gold Aluminum

Gold jewellery can be made with some special (unusual) colour effects, either due to intrinsically coloured intermetallic phases or to surface layers grown by reaction with alloying metals or by deposition techniques. A wide range of colours such as blue, black, brown and purple can be achieved and a number of techniques employed. However, there are some drawbacks: intermetallic colours are intrinsically brittle and surface coatings, by any technique, are liable to be fragile and will spall if knocked, and wear away if rubbed constantly. In simple terms, these are analogous to chemical compounds. Gold jewellery with such colour effects is commercially available and becoming increasingly popular. Some of these exotic colours are obtained by alloying gold with certain other metals to produce special alloy structures known as intermetallic compounds. which possess the desired colour. Solid pieces of coloured gold intermetallics can be made by vacuum melting gold and aluminium in the correct ratio and casting. These are brittle and cannot be worked in the traditional manner. However, they can be applied to a substrate, such as a conventional carat gold, by thermal spraying in a gas jet.


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Rose Gold

The precious metals of silver and copper are blended in an alloy with pure gold to create rose gold. Gold and copper are the only coloured metals, all the rest are silvery in colour. Rose gold does not occur in nature. Rose gold is made using a mix of pure gold with alloys including copper. Rose gold has a very subtle and delicate colour that intensifies with age. Common 18k rose gold alloy constituent quantities are: 75wt% gold and 25wt% copper and 75wt% gold, 21wt% copper and 4wt% silver. Rose gold may also vary quite a lot in colour depending on the amount of copper mixed with the gold, 9k rose gold has a darker rose-copper colour than 18k rose gold which has a more subtle rose colour. Tumbaga is a gold and copper alloy.


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Purple Gold :: Amethyst Gold :: Violet Gold :: Purple Gold Alloy :: Gold-Aluminum Purple :: Gold-Aluminum Purple

Purple gold is produced when gold and aluminium are alloyed together in the ratio 79:21 by weight. In this ratio they form a gold inter-metallic compound with the chemical formula AuAl2. The gold alloy formed has a purple, amethyst or violet colour. This purple gold alloy can be hallmarked as 18k gold. There are a number of processes that can produce purple gold. Vacuum Melting, Physical Vapour Deposition (PVD), Powder Metallurgy, Vacuum Melting, Diffusion Bonding, Thermal Diffusion, Thermal Spraying, Mix Gold Chloride with Rochelle Salt. The conventional jewellery application of purple gold is in form of cast and ground items, which are set similar to gemstones.


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Gold Aluminum :: Gold Aluminium :: Gold Aluminum Intermetallic Colors (Colours) :: Gold Aluminum Alloys for Jewelry

Gold jewellery can be made with some special (unusual) colour effects, either due to intrinsically coloured intermetallic phases or to surface layers grown by reaction with alloying metals or by deposition techniques. A wide range of colours such as blue, black, brown and purple can be achieved and a number of techniques employed. However, there are some drawbacks: intermetallic colours are intrinsically brittle and surface coatings, by any technique, are liable to be fragile and will spall if knocked, and wear away if rubbed constantly. In simple terms, these are analogous to chemical compounds. Gold jewellery with such colour effects is commercially available and becoming increasingly popular. Some of these exotic colours are obtained by alloying gold with certain other metals to produce special alloy structures known as intermetallic compounds. which possess the desired colour. Solid pieces of coloured gold intermetallics can be made by vacuum melting gold and aluminium in the correct ratio and casting. These are brittle and cannot be worked in the traditional manner. However, they can be applied to a substrate, such as a conventional carat gold, by thermal spraying in a gas jet.


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Green Gold

Green gold is not really green. Green gold normally appears as a very subtle, greenish yellow tint rather than what we would normally call green. Blending of silver and pure gold produces the colour tone found in green gold and that we call green gold alloy. Green gold alloy is made by reducing the copper content from an alloy mixture and using just gold and silver. Green gold was known to Lydians from around 2,900 years ago. They knew it as electrum. The ancient Greeks called it gold or white gold, as opposed to refined gold. The greenish colour of green gold is achieved when raising the silver:gold ratio of the alloy. Green gold has been created by a patination technique on copper-containing carat gold alloys. The classic mixture that produces green gold is an alloy of pure yellow gold and pure silver -- though, for rings, harder metals such as zinc are used to make the gold more durable.


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Gold Colors

Pure gold does not occur naturally as rose, white, or green gold. Pure 24k gold is only ever one colour: yellow. Any carat (karat) other than 24K gold (pure gold) is called an alloy. Most other pure metals are grey (gray) or silvery white: gold is yellow. This colour is determined by the density of loosely bound electrons which fall into the visible range for gold and copper but in the ultraviolet range for all other metals. Pure, 24k gold is soft. Alloying it with other metals alters its hardness, ductility, melting point and colour (and other properties). In this article we are interested only in the colour variations that occur when varying weight amounts of other metals are used with gold. Pure gold is yellow in colour. Coloured gold has various hues produced by alloying gold with other elements. Gold is mixed with other metals to produce alloys, simply mixtures of two or more metals.


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Vintage Rhinestone Christmas Tree Brooch Pin

It is almost impossible to celebrate Christmas without a rhinestone Christmas tree brooch on your lapel or sweater. If you are a collector of vintage jewelry, you can find some lovely and unique vintage rhinestone Christmas tree brooches so that you will have a different pin to wear for every Christmas party or event. While most vintage rhinestone Christmas tree brooches are quite affordable, there are some highly collectible pins that are more valuable.


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