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.
I have a chain that’s stamped with 128 and EZI. I’m showing that’s real. Is that correct?
Hi Tina! Yes, “128” and “EZI” likely refer to manufacturer marks, but they don’t confirm metal authenticity. You may want to have the chain tested to verify if it’s real. Hope this helps 🙂
I have a ring that has 9841 on it. What does it mean?
The stamp “9841” on a ring does not correspond to a typical hallmark for precious metals like gold, silver, or platinum. It is more likely a manufacturer or model number, used to identify a specific design or production batch for the jeweler or brand that made the ring. If you’re looking for information about the material, you should also check for standard purity stamps like “925” for sterling silver or “750” for 18K gold.
So I have a silver ring with 925 stamped on it and then what looks like an a precious stone
Hi Cheri! Thanks for commenting. The “925” stamp means your ring is made of sterling silver, which is 92.5% pure silver. The stone could be precious or semi-precious; a jeweler can help identify it for you or we can help you with our appraisal service 🙂
Could you tell me what the mark indicates between the 925 and 18K?
The mark between the 925 and 18K typically indicates the maker’s mark or a hallmark from the manufacturer. It helps identify the origin or authenticity of the piece. If you’d like, feel free to share an image via our website, and I can help you look into it further!
Man’s wedding band not sure the star means looks like there might have been something next to it. The other inside of the ring is stamped with the word masterpiece. Looking for time period and or manufacturer.
The star mark could be part of a maker’s mark or hallmark, which sometimes indicates the manufacturer or origin of the piece. “Masterpiece” is often used by certain jewelers to signify a high-quality, handcrafted item, but it’s difficult to pinpoint the exact time period or manufacturer without more details. Our appraisal service can help you identify these details!
I have a ring stamped 10k and has a heart with the letter D in the middle of the heart, what does that mean?
The “10k” stamp indicates that the ring is made of 10-karat gold. The heart with the letter “D” is most likely a maker’s mark, used to identify the jeweler or manufacturer who crafted the piece. Our jewelry appraisal service can definitely help you look into it more 🙂
hi there I’ve got this ring and I need some help with the hallmark please, I think it is t.d ? What does it mean? What is it worth?
I’m attaching a photo, my email is [email protected] thank you
Hi Maria, thank you so much for commenting on our post! I reached out via email to help you look into your ring further 🙂
This is all so interesting. My daughter inherited a necklace and bracelet that look similar and may be a set. The marks are: lower t & c, 10k. Could you help identify this for us, thank you
Can anyone help me identify this marking.
Hi Shifa, thank you so much for commenting! I reached out via email to help you with your ring 🙂
What does PAT. AC10 on the inside of an old braclet stand for. Please and thank you
“PAT. AC10” likely refers to a patent number or code related to the design or mechanism of the bracelet. “PAT” stands for “patent,” and the following letters and numbers could indicate the specific patent or design registration for that piece. To get more details, you may look into our appraisal service!
Hello, I have a gold ring with stones. What are this marks inside of it ?
The marks inside your ring provide key details about its origin and composition. The “S.G” is likely the maker’s mark, identifying the jeweler or company. The “375” indicates that the ring is made of 9-karat gold, meaning it’s 37.5% pure gold, which is common in the UK and Europe. The other symbols likely represent a hallmark from an assay office verifying the gold content, and possibly a date letter indicating when the piece was made. For exact details, especially regarding the symbols, our appraisal service can definitely help!
my necklace is stamped with 14K and the letter H
The “14K” stamp on your necklace indicates that it is made of 14-karat gold, meaning it contains 58.5% pure gold. The letter “H” is likely a maker’s mark, representing the manufacturer or jeweler who crafted the piece. Maker’s marks can vary, so if you’re curious about the specific jeweler, you can check out our appraisal service here – https://quickjewelryrepairs.com/repair/jewelry-appraisal/ 🙂
What does Pta – 900 with initial MP on it mean?
“Pta – 900” refers to platinum with a purity of 90%, which is a common standard for high-quality platinum jewelry. The “MP” is likely the maker’s mark, identifying the jeweler or manufacturer who crafted the piece. Platinum jewelry is typically marked with a purity stamp like “900” to indicate its metal content, and the maker’s mark helps trace the piece back to its origin. Hope this helps! 🙂
Hi, guys! I have this ring (looking like proposal) and it’s “CI 14K” stamped. I guess 14K is a gold..? But what does “CI” mean?
Hi there! Yes, you’re right—”14K” indicates that the ring is made of 14-karat gold, meaning it’s 58.5% pure gold. The “CI” is likely the maker’s mark, representing the jeweler or manufacturer who crafted the ring. Maker’s marks vary, so “CI” could be specific to a certain brand or jeweler. If you’re interested in finding out more about the maker, you may want to try our appraisal service – https://quickjewelryrepairs.com/repair/jewelry-appraisal/ 🙂
I have a necklace that appears gold. It is a vintage choker style. Each piece has a number stamped on the back. Up the back of the left side is numbered 1-30 and the right side is the same 1-30 like the order the pieces go in for assembly however I can not find another like it anywhere that has these numbers on the back.
The numbers on your vintage choker likely indicate the order for assembly, a method used by manufacturers for intricate pieces. This suggests it might be a custom or limited-production piece, adding to its uniqueness. If you’d like to know more about the piece, you can try our appraisal service here – https://quickjewelryrepairs.com/repair/jewelry-appraisal/ 🙂
Hi. I have a string of 7.5 mm cultured freshwater pearls with a clasp on it that’s says 14k and underneath it says china???
Hi! The “14K” stamp on the clasp indicates that it’s made of 14-karat gold. The “China” mark means the clasp was manufactured in China. It’s common for pearl jewelry, including cultured freshwater pearls, to have gold clasps made in China, which is a major producer of pearls and fine jewelry. 🙂
I have a silver coloured ring that has just 750 stamped on it no other marks
What does that mean
The “750” stamp on your ring indicates that it is made of 18-karat gold, which is 75% pure gold. Even though the ring appears silver-colored, it may be white gold, which is a mixture of gold and other metals like palladium or nickel to give it a silvery appearance. If there are no other marks, it’s likely a simple 18K gold piece, possibly white gold. 🙂
Can someone tell me what a 10K GF V over diamond stamp inside my wedding band means?
The “10K GF” stamp means that your wedding band is made of 10-karat gold that is gold-filled (GF). Gold-filled jewelry has a thick layer of gold bonded to a base metal, which is more durable than gold plating. The “V over diamond” is likely the maker’s mark or manufacturer’s symbol, identifying the jeweler or company that made the piece. This combination indicates a gold-filled wedding band with a jeweler’s specific mark.
Hi there, I have pieces of a watch. On a gold part of the watch I see a XZ 30. Anybody know what that means?
The “XZ 30” mark on the gold part of your watch could be a manufacturer’s code or reference number. These marks are sometimes used by watchmakers to indicate a specific model, series, or batch. If it’s an older or vintage piece, it may also be a code unique to that brand or model year. If you’d like to have it looked at, you may check out our appraisal service! – https://quickjewelryrepairs.com/repair/jewelry-appraisal/
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.
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