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https://www.quora.com/What-does-925-Au-c-mean-on-a-gold-necklace-mean-Is-it-real
The number 925 means the purity of the metal (in our case, such metal is represented by gold as Au is Aurum from the periodic table of basic elements). Thus, the purity of the gold is 92.5%, i.e. 1 gram of gold includes 92.5 mg of Aurum. The rest 7.5 mg embrace other metals such as …
https://www.answers.com/Q/What_does_925_AU_stamped_in_a_ring_mean
What does 925 AU mean on a gold and diamond ring? 925 usually refers to sterling silver, being 92.5% silver with 7.5% copper. However, Au is the chemical symbol for gold.
https://learningjewelry.com/guides/buying-silver/925-jewelry/
Specifically, a 925 stamp means that 92.5% of the metal in that ring is sterling silver. The remaining 7.5 percent is composed of metal alloys, which is a mixture of different metals (like copper) fused with silver to create jewelry quality durability. Fine silver jewelry is pure silver, or stamped 999.
https://www.quora.com/What-does-925-au-mean-on-a-silver-ring-with-black-n-white-diamond
‘925’ stamped in a ring means its make of sterling silver with a purity of 925/1000′ an not of gold; ‘Au’ usually stands for gold not silver; However ‘au ©’ may be the jeweller’s maker’s-mark, which is his stamp that identifies the jewellery or manufacturer’s company.
https://www.jewelrynotes.com/what-does-a-925-mark-mean-when-stamped-on-gold-jewelry/
You can see gold-plated jewelry here. In this case, the 925 number makes sense, as it denotes the purity of the underlying silver core, not that of the gold plating. A “925” Mark Is Usually Stamped on Gold Vermeil. So, if your gold piece is marked with a “925” stamp, what you have is likely gold vermeil (pronounced ver-may). This is the name used to denote silver jewelry covered with a thin layer of gold.
https://www.jewelry-auctioned.com/learn/buying-jewelry/sterling-silver-vs-925-silver
The purity of silver lands on a numeric scale, or rating system, based on 1,000. Pure silver gets a 999 rating. In order for a silver to be classified as sterling silver, it must meet at least a 92.5 purity, AKA 925. So, as you can see: 925 silver is sterling silver.
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