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https://www.globalintergold.info/en/the-mystery-of-blue-gold-zo92/
Jul 31, 2018 · The usage of blue gold. The original color of the metal is intended to attract the attention of clients to the jewelry. Due to the poor malleability of the alloy, jewelry pieces made of blue gold are rare and therefore in high demand. Due to its fragility, blue gold is used in jewelry …
https://www.etsy.com/market/blue_gold_jewelry
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https://www.glamour.com/story/blue-gold-jewelry
Aug 25, 2014 · Blue Gold New Trend In Fine Jewelry Glamour. Dressed. Calling All Jewelry Lovers: Have You Heard of Blue Gold? It's a Thing, and It's Gorgeous. As part …Author: Leah Melby Clinton
https://www.ganoksin.com/article/different-coloured-gold-alloys/
The blue surface layer is between 3 and 6 m in thickness. An 18 carat gold alloy, which consists of 24.4wt%Fe and a maximum of 0.6wt%Ni (49), forms a blue oxide layer on heat treatment in the atmosphere between 450 and 600C°. The oxide layer turns to a blue-green colour with an increase in gold content to 85wt%.
https://vivalatina-shop.com/blogs/custom-made-jewelry/the-different-colors-of-gold-used-in-jewelry
18k black gold ring for men. Blue gold. Composition of 18 k blue gold (750/1000): 75% fine gold + 24.4% iron + 0.6% nickel The alloy is then heat treated in order to oxidize the iron and thus obtain a superficial blue color . Note that although Nickel jewelery is prohibited in Europe, there are allowable emission standards.
https://bluelakesgoldandsilver.com/jewelry/
Gold filled jewelry has gold that is bonded to a base metal, usually sterling silver or brass. Gold filled also uses a gold alloy that will make it stronger depending on the karat used. Unlike gold plated, gold filled jewelry has a much thicker coat, though the gold still makes up a fraction of the item’s weight.
http://newsletter.kaijewels.com/gold-colors.htm
However it is possible to create jewelry with gold of unusual colors like purple gold, blue color gold and even black color gold. How Is Purple, Blue, And Black Colored Gold Produced This is possible by using one of two methods, the first is by formation of special gold metal compounds also referred to as Intermetallic Compounds .
https://en.wikipedia.org/wiki/Colored_gold
Blue gold is an alloy of gold and either gallium or indium. Gold–indium contains 46% gold (about 11 karat) and 54% indium, [3] forming an intermetallic compound AuIn 2 . While several sources remark this intermetallic to have "a clear blue color", [2] in fact the effect is slight: AuIn 2 has CIE LAB color coordinates of 79, −3.7, −4.2 [10 ...
https://www.afashionblog.com/alloy-jewelry/
The resulting alloy is one that does not tarnish. That is typically the case with alloyed metals, particularly gold and silver. When used in their pure form, what you can expect is for the metal to bend and scratch easily and tarnish due to exposure to other elements. Alloys are, therefore, useful metals for jewelry.
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