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 2 rings that I have questions on. One is silver looking with a gem/diamond center with the marking NVC.
The other is a silver Claddaugh ring with a 8 on the inside.
Thank you in advance.
Hi there, those are just makers marks!
Hi there!
Recently bought a pair of 14K Yellow Gold & Diamond cluster Stud Earrings, on the stud and also in the back clasp reads CU14K can you tell what this means?
Hi there, CU is a makers mark and the 14k indicates what type of gold 🙂
I have a gold class ring from 1933. It has a stamp that says “D 10k”. I get the 10K but is the D just a manufacturer stamp? Thank You
Hi Paul, yes the “D” is most likely a makers mark!
I have an old heart broach with 900 stamped on the back. Has another stamp and hard to tell what symbol it is, looks like a circle with a star. Has stones Surrounding the heart. Had it for years. What metal is it likely to be please?
Hi Louisa, usually 900 means it is real silver!
C253Y mean anything stamped in a ring my mom gave me?
Wat does 925 and italy and PGDA on a neckless
Hi there, that means its sterling silver made in Italy and the PGDA is a makers mark!
I have an antique silver poison ring I got as a gift years ago, the back of it is clearly stamped “REG 571”. Can you possibly tell me what that means?
Hi there, I believe it’s just a makers stamp on your ring!
I got a ring with three stamps on it, I can’t make out the top stamp but it kinda looks like 17, under that is a 87, and underneath that is a c in a circle. Please help.
Any idea what PL-18k means ?
Plated or platinum?
Hi there, that means its 18k platinum!
Sorry about all the spelling so what does 19p mean stamped inside my ring bsnd
Hi there, I believe it means “P” for Plumb Gold (this shows the item is at least the amount of karats shown on the stamp)
What foes 19p mean stamped insode my ting band
Hi I have 2 items which have 900 Ari’s on the inside what does that mean
Hi there, this stamp designates that the piece is made of one of the two most common platinum alloys
Hello my daughter has found what appears to be silver ring it has dia .15 stamped on the inside what does this mean.
I have a sliver diamond ring stamped 4k 12
I have a diamond ring that says 14k inside and also a stamp that looks like lines and boxes 4 in a row. Anyone know what that means?
Hi there, the stamp is a makers mark of whoever created the ring!
I have a 14 k ring stamped only 14k D 046 024. Please help? If the stones are diamonds, I do not recognize the D 046,024.
What does 24 k gl mean on a necklace
I have an old necklace and the clasp is stamped P.37
Do you happen to know what that would indicate?
what does CT2 and 375 inside the shank mean
I have Commemorative Coin with 999 symbol, do u know what does the symbol means?
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