Pure gold is slightly reddish yellow in color, but colored gold in various other colors can be produced.
Colored golds can be classified to three groups:
Alloys with silver and copper in various proportions, producing white, yellow, green and red golds; typically malleable alloys
Intermetallic compounds, producing blue and purple golds, as well as other colors. These are typically brittle but can be used as gems and inlays
Surface treatments such as oxide layers
Pure 100% gold is 24 karat by definition, so all colored golds are less than this, with the common being 18K (75%), 14K (58%), and 9K (38%).
Alloys
White gold
White gold is an alloy of gold and at least one white metal, usually nickel, manganese or palladium. Like yellow gold, the purity of white gold is given in karats.
White gold's properties vary depending on the metals and proportions used. As a result, white gold alloys can be used for many different purposes; while a nickel alloy is hard and strong and therefore good for rings and pins, gold-palladium alloys are soft, pliable and good for white gold gemstone settings, sometimes with other metals like copper, silver, and platinum for weight and durability, although this often requires specialized goldsmiths. The term white gold is used very loosely in the industry to describe karat gold alloys with a whitish hue. It is a common misconception that the color of the rhodiumplating, which is seen on many commercial pieces, is actually the color of white gold. The term "white" covers a large spectrum of colors that borders or overlaps pale yellow, tinted brown, and even very pale rose. The jewelry industry often conceals these off-white colors by rhodium plating.
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Gold prices rose, fueled by expectations of a potential Fed rate cut and economic uncertainty ... Gold prices rose slightly to $2,665 per ounce, supported by declining Treasury yields ... Gold rose above ...
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On the downside, there was a year-on-year decline in coal and gold,” Terblanche said ... The largest positive contributors were gold which rose 42.3%, manganese ore which raised sales by 48.8%.
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Brent crude, the international benchmark, rose 1.1% to $73.11 a barrel.Gold fell 0.7% to $2,569.10 an ounce.The 10-year Treasury yield dipped three basis points to 4.418%.Bitcoin edged up to $91,466.Read the original article on Business Insider.
