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https://www.antique-jewelry-investor.com/what-does-k18-mark-on-a-ring-shank-mean-comments.html
Japanese jewelers use K18 for gold standard of 18 carat. It is not filled, or plated. Look for an "M" in a shell... that would be a Mikimoto hallmark.
https://www.antique-jewelry-investor.com/what-does-k18-mark-on-a-ring-shank-mean.html
Acquired in late 1960s this ring was valued in 1970s stated as 'Cultured Pearls' and stated as gold. I would like to sell it now but need to know if K18 means the ring metal is 18 carat gold. I do not know the origin of the ring, it was purchased in a Scottish Antique Jewellery shop. Your assistance would be …
https://au.answers.yahoo.com/question/index?qid=20130723132309AA4APXF
Jul 23, 2013 · What does the mark "K 18" mean on a brooch? (NOT REFERRING TO TYPICAL 18K MARK*) I collect old jewelry. I have seen this mark on a ring and a brooch, advertised as solid 18k gold but the quality and detail just isn't there. I think its rolled gold but I can't find an answer though I have searched for months.(I also saw a ring recently marked "K 12" Any antique jewelry experts or retired ...
http://metaldetectingforum.com/showthread.php?t=195252
Aug 07, 2014 · It is marked K18. Does this mean it is 18 karat gold? Any idea what the symbols mean? #2 07-23-2014, 11:09 PM ... Sounds like a pretty identifiable piece of, what appears to be, valuable jewelry(?) or religious artifact.
https://www.jress.com/blogs/news/are-18k-gold-gp-and-18k-gold-gf-real-gold
While their names are made purposely similar to 18k Gold, but the short answer is, No, any piece of product, even with some carefully chosen words to confuse customers such as "solid", if its name contains GP (gold-plated) or GF (gold-filled), it should not be considered as gold jewelry.
https://www.raregoldjewelry.com/guide-stamps-inscriptions-gold-jewelry
3 Digit Numbers. These numbers tell how pure the gold is. They are in the thousandth, so if you want to know the purity percentage, just move the decimal point in one space. For example: 750 is 75.0% pure gold (or 18 karat) Here’s an easy chart: 999.9, 999. 24 carat; also called “three nines fine”.
https://quickjewelryrepairs.com/articles/jewelry-stamps-what-do-they-really-mean/
750 stamp on jewelry means 18k Gold 417, 585, or 750 – this is just another way of telling us the gold content. However, instead of referring to how many parts out of 24 are pure gold, this number is now out of 1,000. So for 10K gold jewelry, 417 out of 1,000 parts are pure gold.
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