What does gm 925 CN mean on jewelry?

The term gm 925 refers to the alloy that the jewelry is made of. It was created by General Motors as an improvement over the previous gm 923, which could be prone to cracking. The new alloys are harder and better-suited for cold working processes, such as bending, which were previously difficult.

What does gm9 gold mean on ring?

The gm9 mark is a hallmark used to show that an item was made using 925 pure gold. This mark is similar to the food safety stamp but instead of showing that the item is made of a certain percentage of pure gold, it simply shows that it was made using 925 pure gold.

9 gm meaning on jewelry?

925 means that the alloy was certified by an organization called the Assay Commission (or Assay Office) of the Bureau of Standards, now known as the National Institute of Standards and Technology (NIST). Only items that are made of 925 alloy can bear this mark. The mark ensures that this alloy has been certified as having the properties it claims. To be certified, the alloy is tested for purity, and then hardened by repeatedly heating and cooling it in a furnace. This process helps make

What does the word GM 9 CN mean on ring?

gm 925 is a proprietary alloy of 925 sterling silver composed of 92.5% pure silver and 7.5% copper. It’s an alloy developed by General Motors in the early ’50s to manufacture jewelry. Its lower cost made it more accessible to customers and the metal became the standard for fine jewelry made in America.

What does gm9 CN mean on ring?

The gm9 ring setting is first used for the Patek Philippe brand, and it was created in 1955. The cushion cut diamond that is set into this ring is known as the Patek Philippe diamond. If you are looking for a ring with a distinctive look, the Patek Philippe ring is a great choice.