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https://goodjewelleryguide.com/jewelry-hallmarks-guide/
Jan 21, 2021 · The first requirement for all jewelry to be found on the market is to have these marks. There are some generally accepted rules and signs around the world. If you have gold jewelry, you should see markings like 18k, 14k, 10k, 750, 585, or 375. If you have silver jewelry, you should see markings like 925 or 800.
https://www.jewelry-auctioned.com/learn/jewelry-how-tos/how-to-understand-the-meaning-of-gold-hallmarks
Green gold is typically made up of three different colors may also a sign that each jewelry piece may also be a part of “Age of Modern Jewelry”. Bright Red. This color was formed through a combination of fine gold together with a large portion of copper. 9k gold is 37.5% and stamped hallmark 9K or 375. Hallmark stamped k or kt is same.
https://www.antique-jewelry-investor.com/gt-hallmark-on-vintage-gold-ring-comments.html
The hallmark says G&TJ 375 I'm wondering if anyone knows where I might go looking to find the origins and time frame for when the ring was made. I'm guessing it's vintage but a facebook groupchat has informed me there's a chance it could be antique possible 1830s.
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