Many of us have seen the small numbers or letters engraved inside a ring band or near the clasp of a piece of jewelry that we own. But how many of us understand what information those stamps are actually giving us?
In this post, we’ll walk through the different stamps, what they mean, and what you need to know about stamping laws to ensure you’re getting the most accurate information about your jewelry. Let’s start with the basics:
- 10K, 14K, 18K, 24K, etc – if this is the ONLY stamp on the piece, it is telling you first and foremost that the piece is solid gold and secondly, the karat fineness of the gold. For example, let’s look at 14K. 14 out of 24 particles in the metal are pure gold. The others can be a mix of elements including palladium, copper, etc. These additional elements are what determine the specific color of the gold (we’ll talk about this in an upcoming post).
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. For 14K gold jewelry, 585 parts out of 1,000 are pure gold. So when you see 750 that means 18K gold jewelry because the metal is made of 750 parts per 1,000 of pure gold.
- 900, 900PT, PT900, 950, 950PT, PT950 – all of these stamps designate that the piece is made of one of the two most common platinum alloys. 900, 900PT, or PT 900 all signify that the metal used is 900 parts per 1,000 pure platinum, while 950, 950PT, and PT950 denote 950 parts per 1,000 are pure platinum.
- 925 – a piece with this stamp is made of sterling silver. Legally, to be considered sterling silver a piece has to consist of 92.5% pure silver, with only 7.5% other elements mixed in.
- GP – pieces with this stamp have been plated with gold, but have another metal underneath. It almost always has the karat fineness of the plating listed, i.e. 18K GP.
- HGE – this is the abbreviation for high grade electroplate, which is another way of denoting that the jewelry you are looking at is not solid gold. These pieces also generally display the karat fineness of the gold.
- GF – this stands for gold-filled, which is a term that means a thin layer of gold was bonded to a base metal to make this piece.
So now that we have the basic stamp meanings down, let’s go through some of the most frequently asked questions that we hear from customers:
There’s another symbol next to the metal content stamp that isn’t on your list. What does that mean?
Most likely, the stamp you are seeing here is the manufacturer’s trademark or the trademark of the retailer selling the piece. This is legally required if the item is stamped and serves as a guarantee of sorts that the manufacturer/retailer vouches for the accuracy of the stamp on the metal.
My jewelry piece isn’t stamped at all. Does this mean it’s not made of precious metal?
Not necessarily. The legal guidelines on stamping don’t require all pieces made of precious metal to be stamped. However, they do require the manufacturer or retailer to disclose any precious metal content. This could be via discussion in the store upon purchase, on a tag attached to the piece, or on the receipt for the product itself.
The clasp/closure/earring backs on my piece are stamped, but the rest of the item is not. Does that mean the whole thing is made of precious metal?
Again, not necessarily. Sometimes the clasp of a piece is made of a different metal than the chain, so definitely confirm with the store clerk or jeweler that the entire item is made of the metal from the stamping. Likewise, earring backs may have been accidentally swapped and may not be made of the same metal as the rest of the earrings, especially the posts, so double checking is always best.
My piece has a name/date engraved on it. Is this the designer or year that the piece was made?
For well-known brands and designers, this can be the case, but it isn’t necessarily a correct assumption. For example, Tiffany & Co. has several Paloma Picasso designs that would be engraved as such and may include the date. However, it could also be that the piece is vintage or estate and was engraved with the previous owner’s name, anniversary, etc.
What other questions do you have about jewelry stamp meanings?
Community Discussion
Questions, experiences, and expert answers from the QJR community.
What does A-1 mean on 10k gold pendant please?
The “A-1” stamp on your 10k gold pendant likely refers to the quality rating or could be a manufacturer’s code. In some cases, “A-1” is used to signify high-quality craftsmanship. However, it can also be a maker’s mark or internal code used by the jeweler or brand. The “10k” confirms that the pendant is made of 10-karat gold, containing 41.7% pure gold.
I have an opal ring, with diamonds all around. Inside there is one inscription 14K. Also just before that, the # 1420. What does the # signify?
The “14K” stamp indicates that your opal ring is made of 14-karat gold. The “#1420” is most likely a manufacturing or style number used by the jeweler or manufacturer to identify the specific design or model of the ring. This number helps distinguish the piece within their production line or catalog. It doesn’t usually indicate anything about the gold or gemstones but helps track the design or order.
925 MC 7H
VERY curious on what this stamp means
The “925” stamp indicates that the piece is made of sterling silver, which is 92.5% pure silver. “MC” is likely the maker’s mark, identifying the manufacturer or jeweler who crafted the piece. The “7H” could be a production code, batch number, or model identifier, used internally by the manufacturer. Together, these marks help identify the material, origin, and possibly the specific design of the piece.
I have an old chain that says 1-10 D & C on the spring clasp, does that mean 10 k?
The “1-10 D & C” marking on your chain’s clasp likely indicates that it is gold-filled rather than solid gold. Specifically, “1-10” means that the piece is made of 1/10th gold by weight, with a layer of gold bonded to a base metal. “D & C” is most likely the maker’s mark identifying the manufacturer. This does not indicate 10k gold, but rather that the chain is gold-filled with 10% gold content.
I Have A Ring That’s 14K White Gold & Natural Gemstone & Diamond Ring With A Stamp OD & On The Other Inner Side Of The Band Is 14K ! Does Anyone Know What OD Initials Stand For?
The “OD” stamp on your ring is likely the maker’s mark, identifying the jeweler or company that crafted the piece. These marks are used to trace the origin of jewelry but can vary widely between manufacturers. If you’re curious about the specific brand or jeweler, you may avail our jewelry appraisal service! 🙂
Can anyone please give me some insight as to what these four digits stamped on my anniversary band mean? 6748
Thank you
The four-digit number “6748” stamped on your anniversary band is most likely a style, model, or inventory number used by the manufacturer to identify the specific design of the ring. This helps the jeweler track or catalog the piece within their collection or production line. It doesn’t relate to the metal or gemstone content but serves as an internal reference for the jeweler or retailer. 🙂
I have a ring that looks vintage and has js stamped on the inside,what does that mean ??
The “JS” stamp inside a ring often indicates the maker or designer, which can vary based on the specific jewelry piece. It might refer to a specific jeweler or company that produces vintage-style jewelry. Sometimes, “JS” could also denote a particular type of metal or alloy used. To get more precise information, you might want to check our jewelry appraisal service 🙂 https://quickjewelryrepairs.com/repair/jewelry-appraisal/
Good day,
I have a ring stamped 1588 PLAT 18CT
What does that mean?
Kind regards
Lizel
Hi Lizel! 18CT indicates a stated 18-carat gold component, while PLAT commonly refers to platinum. Some pieces combine the two metals, but the full marks and construction need examination before confirming that for your ring. 1588 is not enough on its own to date it. If you need a value assessment, our appraisal service is here: https://quickjewelryrepairs.com/repair/jewelry-appraisal/.
is 4K a thing now? the ring i bought is supposed to be 14K but it is stamped 4K
Hi Kristen! A visible 4K stamp is not enough to establish that a ring sold as 14K is genuine 14K gold. It could be a worn or incomplete mark, or something else entirely. Keep the sales description and ask for independent metal testing rather than assuming the missing 1 wore away. You can see the relevant service here: https://quickjewelryrepairs.com/repair/metal-testing/.
Hi, I have a silver tennis bracelet with .925 and 3 cc stamped on it. I know the .925 means Sterling silver, but what does the 3 cc mean? My daughter bought it for me from a reputable jeweler, and was told it was real diamonds. Was she ripped off?
Hi Christine! 925 refers to the stated silver content, not the type of stones. The 3 cc mark alone cannot establish diamond weight, authenticity, or whether your daughter was misled. Ask for the original sales description and have the stones examined. You can review our appraisal service here: https://quickjewelryrepairs.com/repair/jewelry-appraisal/.
Diamond Gold ring marked corona 10-10k. Also another diamonds ring that’s goes with it marked 10-14k. Would the diamonds be real? What does the first 10 stand for?
Hi Jamie! 14K is a gold-purity mark, but the extra 10 and the full 10-10K or 10-14K combinations need more context. They do not establish whether the stones are diamonds. Please have the stones and metal examined before relying on a value or authenticity claim. Our appraisal service is here: https://quickjewelryrepairs.com/repair/jewelry-appraisal/.
Ring with emerald stamped ‘Sterling ‘ (usually sterling silver is marked 925) is this an inscription or is it stating that it’s sterling silver? Not sure ignoring emerald is real how would I be able to tell if it’s real?
Hi Jamie! Sterling is a recognized way to mark sterling silver, just as 925 is; it is not necessarily a personal inscription. Neither mark establishes whether the green stone is emerald. The metal and stone need separate examination. If you need a value assessment, you can review our appraisal service here: https://quickjewelryrepairs.com/repair/jewelry-appraisal/.
I have a diamond solitaire in an enhancer. Both are stamped “14k”. But the solitaire has an additional stamp of “1/3”. I have scoured the internet to find out the meaning of the “1/3”. I have found nothing. Any ideas?
Hi Suella! 1/3 may refer to a stated one-third-carat diamond weight, but that interpretation is not certain from the stamp alone. The 14K mark refers to the stated gold purity, not diamond authenticity. Have a jeweler examine the stone and any original paperwork before relying on a weight or value. Our appraisal service is here: https://quickjewelryrepairs.com/repair/jewelry-appraisal/.
What does s21k mean stamped on my chain
Hi George! If the mark genuinely reads 21K, it indicates a stated gold content of 87.5%. The S is separate and does not let us identify the maker from text alone. A worn or misread stamp can change the interpretation, so testing is advisable if you need to establish the metal content. You can see the relevant service here: https://quickjewelryrepairs.com/repair/metal-testing/.
What dose it mean when your charm is stamped NR14k
Hi Bobby! 14K is a stated gold-purity mark, equivalent to about 58.3% gold. NR is a separate mark, and we cannot identify its maker from those initials alone. If you need to confirm the metal rather than the maker, you can review our testing options here: https://quickjewelryrepairs.com/repair/metal-testing/.
Hi! I have a gold ring with a red stone the stamped:
GFAB (then crown symbol ) 18K A10.
What does that mean?
Hi Ghada! 18K indicates a stated gold content of 75%. The crown, GFAB, and A10 need to be interpreted together; we would not identify a maker or the red stone from that description alone. If verifying the metal is your goal, our testing service is here: https://quickjewelryrepairs.com/repair/metal-testing/.
Hi, I’m not sure if this forum is still active. I have a vermeil pair of stud earrings with a gem that is hallmarked 925, C7, I know the 7 is meant to be a 7 because it is clearly marked on both. I’m wondering if anyone has come across this marking.
Hi Yolanda! 925 normally refers to sterling silver. C7 is not a universal purity mark, and we cannot reliably identify its maker or meaning from the characters alone. A clear close-up of the mark and the whole earring would be needed. Our guide explains the distinction between metal and maker marks: https://quickjewelryrepairs.com/articles/jewelry-stamps-what-do-they-really-mean/.
Hi,
I have a family ring that was made from 2 gold ring melted to make one. There is a 14k and a 10k stamps. Does it refer to the previous 2 rings?
Thanks!
Hi Emma! Those stamps may relate to the original rings, but they do not establish the purity of the finished piece. When different gold alloys are combined, the final composition depends on their amounts and any metal added. Testing is the way to check rather than assuming either old stamp still applies. You can see the relevant service here: https://quickjewelryrepairs.com/repair/metal-testing/.
What does ci 10k mean on a ring it’s on my wedding ring and I don’t know what it means if anyone can help me out it would be great
Hi Cheyyy! 10K indicates a stated gold content of 10 parts out of 24, or about 41.7%. CI is a separate mark and cannot be reliably identified from those letters alone. A stamp also does not authenticate the metal. If you need confirmation of the gold content, our metal-testing service is here: https://quickjewelryrepairs.com/repair/metal-testing/.
I have a question type that hasn’t been covered yet.
I have a 14k gold ring, art deco with a diamond in a black onyx and 5 diamonds to each side of it( 11 total) what’s interesting is it has an inscription that reads “14k mischa to jean 11, 6,38” considering mischa is a Hebrew name, jean is a French name, and the date is literally a couple days before the Holocaust began, is it likely that the ring has value substantially higher than the sum of its parts? Also on the inside cavity that holds the onyx to the band, on the onxy there appears to be a small swastika that is missing it’s top horizontal and it’s bottom horizontal. So it’s like
‘+, missing it’s horizontal hands but having all 4 arms and it’s 2 vertical hands…. thank you to anyone that bothers providing input
Hi Josh! An inscription can be an important clue, but names, a date, and a symbol do not by themselves establish historical provenance or an added collector premium. An in-person appraisal and any family records would be a better starting point. Please email clear photos and the documentation you have to [email protected] to discuss an appraisal. You can see the relevant service here: https://quickjewelryrepairs.com/repair/jewelry-appraisal/.
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