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The name UnoAErre comes from 1AR, the identification mark indicated on the punch affixed to products, assigned to the first goldsmith company of Arezzo (AR). In the sixties production reached the highest levels, and the company employed more than 1200 staff. It began a reduction of its workforce in the early 1970s. Today fewer than 500 are ...
For example, knowing that standard 18-carat yellow gold consists of 75% gold, 12.5% silver and the remaining 12.5% of copper (all by mass), the volume of pure gold in this alloy will be 60% since gold is much denser than the other metals used: 19.32 g/cm 3 for gold, 10.49 g/cm 3 for silver and 8.96 g/cm 3 for copper.
A hallmark is an official mark or series of marks struck on items made of metal, mostly to certify the content of noble metals—such as platinum, gold, silver and in some nations, palladium. In a more general sense, the term hallmark is used to refer to any standard of quality.
The BIS Hallmark is a hallmarking system for gold as well as silver jewellery sold in India, certifying the purity of the metal. [1] [2] It certifies that the piece of jewellery conforms to a set of standards laid by the Bureau of Indian Standards, the national standards organization of India.
It was originally founded in Germany by Friedrich Speidel in 1867 as a manufacturer of gold and silver chains. The Speidel Chain Company was formed in its modern state in the United States in 1904. It was known for its "Ratchet-buckle" watchbands (introduced in 1920), the "Scissors Action Expansion Band" (introduced in 1936), the ladies ...
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