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https://www.jewelry-auctioned.com/learn/buying-jewelry/black-gold-jewelry
Apr 30, 2019 · An alloy is a mixture of two or more metals. Generally, alloys are used as a base metal for plated or filled jewelry, and that is the case with black gold. Gold gets mixed with a darker metal, like cobalt, which creates black gold. When alloys are …
https://www.jewelryshoppingguide.com/what-is-black-gold/
To form a black gold alloy, gold is mixed with another metal such as cobalt, usually to the ratio of 3 parts gold to 1 part metal. However, although this is called an alloy it is not really one. The black layer is only on the surface unlike other alloys where the metals are …
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Black Hills Gold Jewelry features a unique design of grape leaves, clusters and vines in tri- colored gold. By federal mandate, this style of jewelry must be manufactured in the Black Hills of South Dakota in order to be described as “Black Hills Gold Jewelry.”
https://www.gemselect.com/other-info/scratching-the-surface-of-black-metal-jewelry.php
Oct 16, 2015 · There are several ways in which black metal jewelry can be achieved. For example, a black gold alloy can be made. Black gold alloys are typically made from 25% cobalt to 75% gold, though other alloys exist. Though these are referred to as "alloys", the black color is only a surface layer.
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