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https://thinkengraved.com/blogs/news/a-guide-to-what-jewelry-stamps-mean
Jul 19, 2018 · 100% or 24 parts per 24 pure gold. This means no additives. While this is pure gold it is also very soft and tends to bend and scratch rather easily. This is one of the reasons it is rare to find jewelry that is pure gold. As a side note, palladium is …
https://www.thoughtco.com/metal-jewelry-stamps-and-marks-608017
Feb 12, 2020 · Jewelry made from precious metals is often stamped with a mark to indicate the chemical composition of the metal. A quality mark contains information about metal content that appears on an article. It is usually stamped or inscribed on the piece. There is considerable confusion about the meaning of quality marks that are seen on jewelry and ...
https://www.acronymattic.com/PTL.html
140 rows · PTL: Pass Transistor Logic: PTL: Project Technical Liaison: PTL: Photonics Technology …
https://www.quora.com/What-are-all-the-abreviations-and-meanings-that-are-stamped-on-jewelry
In the United States you would find the fineness mark (either some number of K for gold or a 3 digit number for gold, silver, and platinum - Sometimes the alloy mix for platinum; 90Pt10Ir or 95Pt5Ru) and the manufacturer’s hallmark. Sometimes if the manufacturer is small enough the designer also puts his hallmark/initials on the item.
https://www.leaf.tv/articles/what-does-pt-stand-for-on-a-gold-chain/
If the jewelry is marked "PL," "PLAT" or "PT," the piece is made of platinum. The symbol for platinum on the periodical table is "Pt." Platinum Alloy. Platinum is a soft metal and, therefore, high-quality jewelry contains a combination of 95 percent platinum and 5 percent of a metal alloy, such as ruthenium or iridium, to give it strength.
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