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https://www.stevenstone.co.uk/blog/our-blog-1/post/what-is-a-hallmark-and-does-all-gold-jewellery-need-one-1422
What is a hallmark and does all gold jewellery need one? In the UK, it is a legal requirement that any gold jewellery being sold has an official hallmark from one of the four Assay Offices in the UK.
https://www.mygoldguide.in/know-hallmark-gold-us
May 15, 2018 · In the US, there is no single official gold hallmarking system for gold jewellery. Instead, there are independent assaying agencies across states and cities. Jewellers of America is …
https://www.jewelry-auctioned.com/learn/jewelry-how-tos/how-to-understand-the-meaning-of-gold-hallmarks
Pure Gold is almost protected from the effects of oxygen, air, and water. Each country has a diverse series of the system especially in hallmarking gold. In U.S., the transparency of gold is specified by karat. Pure gold has 24 Karat, but it is rarely used to create jewelry because pure gold will not seize gemstones and twists too easily.
https://news.thediamondstore.co.uk/hallmarking-jewellery/
Gold, silver and platinum, and most recently, palladium, must all be hallmarked by UK law. Gold (including all variations of it like white, yellow and rose gold) must be further hallmarked as 9K, 14K, 18K and 22K standards, and so on. Read more about the difference between gold karats here.
https://www.gold.co.uk/info/gold-hallmarks/
Jul 28, 2021 · Gold hallmarks offer owners an indication of the amount of gold contained in an item. This is necessary because pure gold is soft, and would be unsuitable for many applications (jewellery in particular). To increase the durability of gold jewellery, other metals are …
https://www.jewelry-secrets.com/Blog/a-ring-with-no-mark-or-stamp/
Dec 02, 2012 · I have a gold ring I bought from a reputable jeweller (Thomas) in Geelong, Victoria, Australia in 1980. The only mark is 18 CT but no other hallmark. It hasn’t worn off as I have not worn the ring very often. I have had no alterations made to it. It is a gold band with a raised pattern all round. Can you tell me if this is genuine please? Thanks
https://oureverydaylife.com/does-gold-jewelry-have-to-be-stamped-12156915.html
Sep 28, 2017 · Unmarked gold-colored jewelry is most likely simply costume jewelry of little value, but there are a few exceptions to this rule. Jewelry that was made before 1900 may not have a gold mark, and jewelry that was made by an artist or independent jewelry designer may not be stamped.
https://www.jewelrynotes.com/does-gold-jewelry-have-to-be-stamped/
In short, no, a stamp is not a guarantee that a piece is really gold. For instance, gold-plated jewelry can have karat stamps, but they will indicate the purity of the gold plating, not of the entire piece.
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