The Best Selling Jewelry Cleaners



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Marks Stamped Inside Rings

I get emails daily that ask me about the stamp marks (also called hallmarks) inside their ring.

Everyone wants to know what they mean?
Hopefully this post will answer that question.

The most common marks or trademark stamps are used to identify things like:

Metals, carat weights, manufacturer, tradeMarks, jeweler, or designer.

The mark that is the most important is the metal stamp, or karat weight of the metal.

P.S. I also have an ENORMOUS list of unidentified stamps as well: unidentified stamps inside rings (If you know any, help me out and drop me a line)

If you look inside the shank of your ring (the band on the bottom or side), you’ll usually see the karat stamp. More than likely it will be shown as 10k, 14k, 18k or Plat. These are the most common metals and most common markings. But you’ll also run across titanium, stainless steel, tungsten, sterling silver and even palladium (plus some other obscure metals, like those used in class rings – lustrium, lLazon, celestrium?).

Metal Stamps

Karat weight can be written a number of different ways. Each manufacturer is different and can use different terminology. Take a look at the chart below and then we’ll talk about them.

Common metal marks stamped inside rings

9k 9 Karat Gold usually sold in the UK (Not in the USA)
10k 10 Karat Gold (Can be White or Yellow Gold)
12k 12 Karat Gold (Found more out of the states)
14k 14 Karat Gold (Can be White or Yellow Gold)
18k 18 Karat Gold (Can be White or Yellow Gold)
20k 20 Karat Gold (Can be White or Yellow Gold)
22k 22 Karat Gold (Can be White or Yellow Gold)
24k 24 Karat Pure Gold (Yellow Gold)
.417 10 Karat Gold (Can be White or Yellow Gold)
.585 14 Karat Gold (Can be White or Yellow Gold)
.750 18 Karat Gold (Can be White or Yellow Gold)
.833 20 Karat Gold (Can be White or Yellow Gold)
.999 24 Karat Pure Gold (Yellow Gold)
P Plumb Gold (must be the karat weight stamped or higher)
PLAT Platinum
PT Platinum
900 or 950 Platinum
S.S. Stainless Steel
Steel Stainless Steel
St. Steel Stainless Steel
Silver Sterling Silver
S. Silver Sterling Silver
Sterling Silver Sterling Silver
925 Sterling Silver
.950 Another Silver Mark unlike 950 for Platinum
Titanium Titanium
Tungsten Tungsten
Pd Palladium
KP Karat Plumb
CZ There is a Cubic Zirconia stone in the ring (and not a diamond)
G.F. or G.P. Gold Filled or Gold Plated
SOL Solitaire Diamond (usually followed by some carat weight)
6,7,8,9,10 (A number) Some jewelers put the ring size in the shank
cw CW means the Carat Weight of the diamonds or gems in the ring
GE Gold Electroplate
GP Gold Plated
WGD Weight Gold, as in 14 Karat Weight Gold, or 10 Karat Weight Gold

Hallmark Stamp Books

There are some Books on the Market that may help as well:

A Closer Look…

To explain the numbers above a little bit better, they are actually percentages of that particular metal that are mixed with other alloys. For example, 14k gold is 58.5% Gold and the rest are alloys mixed in with it (like silver and copper to make it more durable).

So .585 means 58.5% or 14k gold.

10k is also written as .417 (41.7% gold).

18k is .750 (75% gold).

Karat Plumb

When you see KP stamped inside your ring, which is a “P” at the end of the stamp, like: 14kp, that means that the gold is “Plumb” which means it’s verified to be at least that karat weight marked or more. So if it’s 14kp, it’s at least 14kt gold or higher!


Platinum can be written as platinum, plat, 900 or 950. The 900 means that it is 90% pure platinum and 10% alloy. 950 means it is 95% pure platinum and only 5% alloys mixed in (which gives you a higher platinum content).

Carat Weights

Carat weights are the next most common stamp inside a ring. Carat weights are pretty self explanatory. If you see a number like 1.01, that would mean that the diamond set in the ring is 1.01 carats (One carat and one point).

.50 would mean that a half carat (50 points) is set in the mounting.

Sometimes you will see two carat stamps inside the shank which would mean one stands for the big diamond (usually center solitaire), and the other stamp stands for the total weight of the side stones.

Carat weights are usually just stamped like “.75“, but sometimes you’ll also see ct or carat after it, like .75ct. You may even run across one that looks like this: .75tdw, which means total diamond weight, or the entire diamond weight of all the diamonds in the ring.

Many times the number will also be followed with cw, meaning it’s the carat weight of the gems or diamonds in the ring.

Jeweler’s Stamps

A common stamp that you’ll see inside rings are jeweler’s stamps so you can tell where you bought the ring from. Like “JBR” inside the shank would stand for J.B. Robinson Jewelers, “Pgda” stands for the Piercing Pagoda, Helzberg Diamonds will stamp “Helzberg Diamonds” right inside their rings.

Sometimes these jewelers will abbreviate their store’s names or even use a logo. Every jeweler is different and uses different markings.

Manufacturer’s Stamps

Just like the jewelers, often you’ll see the manufacturer stamped inside the band of the ring. For example ArtCarved will stamp their rings “ArtCarved” so they know it’s their ring and it also helps brand their company, product and image. Take Tiffany for example, they stamp their rings “T & CO“.

Manufacturer stamps can be very useful if you need to find out who made a ring so you could contact them for questions, concerns or even ordering!


There are a lot of great jewelry designer’s out there that put their name right inside their rings. A great designer’s name can carry a lot of weight. A huge designer that most people know would be David Yurman which is stamped © D.Y.

Trade Marks

If you buy a trademarked piece of jewelry, I’m certain it will contain a trademark inside the ring. Trademarks are like the LEO diamond or the Hearts Of Fire diamond (HOF).

If you buy a special cut of diamond, or a trademarked name, look for the stamp, it’ll be there.


One thing you have to keep in mind, is sometimes the stamp is uneven, blurry, or hard to read. This happens when the stamp is hit at a wrong angle, skids when it’s hit, or doesn’t make full contact when it’s imprinted. Often 14 will look like a P, H, or something else. You could also be reading it upside down.

To find out for sure what the letters and numbers are, you should pick yourself up a 10x jeweler’s loupe for perfect identification, even better, a microscope for your iPhone that will take close up pictures at 60-100x optical (very cool device that is pretty inexpensive, but fun to use).

Take a look at some examples of marks and different stamps inside of rings…

Marks Stamped Inside Rings

What Do the Marks Stamped Inside Your Ring Mean

Let’s take a quick look at the images marked 1-7 above…

1) PLAT .46 – This is an interesting ring because you can clearly see that the ring is yellow and not white like platinum. This is a pretty rare instance, but the PLAT stands for the platinum (not plated) head. The diamond (46 points – just shy of a 1/2 carat) is set in a platinum head. The rest of the ring is 14k yellow gold. If I had shown the other side of the ring, you would have seen another stamp that said 14k.

2) R.M.I. 14k – R.M.I. is the manufacturer’s mark and 14k is the 14k yellow gold content.

3) FA PT 900 © – The FA stands for the manufacturer or designer’s initials. The PT means platinum (as well as the 900) and that the ring is also copyright ©

4) 10k – Easy as pie, 10k white gold.

5) 14k NIIi – 14k white gold made by a designer or company with the initials of NIIi.

6) 585 – 585 stands for 14kt gold, white gold in this instance!

7) 18k 750 – Often you will find both karat stamps and their percentage stamps inside of rings. 750 is the same thing as 18k gold (white gold).

Marks can also be wrong!

Keep in mind, things can happen. Stamps or marks can be wrong. The diamonds could have been swapped out, or the mountings reused. The jeweler could have forgot to restamp the correct information on the ring. You never know. They could have also grabbed the wrong stamp (literally a metal stamp, called a karat punch steel stamp, like this one HERE and a forged steel chasing hammer) and struck the wrong info. Plus, some rings don’t even have any stamps. You should know though, that rings sold in the USA should. If it’s not stamped, it could be anything.

A jeweler also wrote in telling me they’ve run across customers who polish out marks inside rings. For example, a ring had the engraving “14KGP“, which stands for 14k gold plated, and they buffed out the P, so it looked like 14KG (not knowing that 14 karat gold is written as 14K, and not 14KG). You just don’t know what you’ll run across.

Any stamp could be wrong or altered!

To be sure of the gold or metal content of any ring you can take it into a local jeweler and have them do an acid test on the metal.

I have seen some silver plated jewelry stamped as sterling silver… NOT GOOD! Plated jewelry should always have GP, GF or PLATED inside the ring. And as always, you should get an appraisal with any jewelry you purchase. Just to be sure.

Markings help us in a lot of ways. They help identify a ring. They help jewelers identify their product. They brand companies and designers. Plus, it also helps people identify possible problems with allergies to gold and nickel.

And if you really must know…

Jewelry Hallmark Stamp Books

So there you go…

What does your ring say?

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Ring Adjusters EMT Emergency Ring Cutter 10x Jewelers Loupe Jewelers Microscope

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Ring Adjusters EMT Emergency Ring Cutter
10x Jewelers Loupe Jewelers Microscope

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  1. Hi I have a old ring with BN

  2. I have a ring that has a horseshoe with a $ in the middle of the horseshoe

  3. I have a ring that has BY stamped on the inside what’s that mean.?

  4. Kerry walker // December 3, 2022 at 2:01 pm // Reply

    Mine says GLM can’t read the rest apparently white gold and sapphire but I’m not sure

  5. I have a ring with STR TRADING marked in it. what does that mean?

  6. The ring s stamp says z p 3 one side and cz and a indented stamp beside it

  7. Hey, i have a ring with a diamond shape or outline with the letter C inside the diamond on the inside of ring.

  8. Lois williams // December 28, 2022 at 10:29 pm // Reply

    i have a ring with best stsmped in it. whats the meaning?

  9. I have a lions head ring with small diamonds for the eyes and a ruby for the nose and it’s asked inside with both 14K and 20k what does that mean

  10. I have a ring stamped 10K + 925
    Then CARIZZA

  11. Carol Bastien // January 18, 2023 at 4:17 pm // Reply

    I have a necklace stamped as follows:
    14K MG and then there’s a symbol that looks like a circle with a C in the center of it. Do you know what this means?

  12. Tracey Bucio // January 19, 2023 at 10:33 am // Reply

    I have a plain silver wedding band that inside is stamped with 925 BEE. Could anyone tell me what does the BEE mean? And no it’s not a honeybee :)

  13. I have a ring with a stone in it, the letter stamped inside is Y, what does this mean?

  14. i have a 1978 class ring stamp inside is is this stand for Kt Electroplated?

  15. Latina Hensley // January 24, 2023 at 7:33 am // Reply

    I have a yellow gold ring with the words Crown 10 on it anyone know what that means ?

  16. what does it mean inside the lady’s ring when it stands with it UK 8 with an arrow through it the arrows pointing right to left

  17. I have a ring with stamped 14k J.R. Co.
    Any idea? I was able to find one other ring with the stamp, but not a lot of information about it.

  18. Shanna Curtis // February 7, 2023 at 9:03 pm // Reply

    I have a ring and it says 10KBMJ…what does that mean? And is it worth anything?

  19. I Have a ring with 925 STS inside, can you tell me what this means please

  20. gold colored ring that’s stamped R & C followed by an underscore with a dot or zero above the underscore then the number 18. Any idea?

  21. w.18K means 18 carat gold. Yes?

  22. This isn’t about rings but I was passed down a Rolex woman’s watch it’s worn where the it shuts and it’s gold everywhere but where it’s worn I read that Alot of vintage ones could have other metals? Is it a real Rolex or a fake? They had loads of money I can’t imagine it being fake

  23. What’s the best way to clean rings that won’t damage them

  24. I have a ring that has 10k and 14k stamped on it beside one another and on other side it’s also got 585 stamped on other side of the band

  25. hi I have a ring and it says 14k I think it’s either TAK it TRK what do those stand for?

    • Steven Lentini // July 17, 2023 at 10:42 pm // Reply

      This means that the ring is crafted in both 10 & 14K. Black Hills Gold designs will be stamped in this manner, or 12k 14k.

  26. I have a bracelet that has a stamp that looks like ST5 or 5T5. it’s not 585. it’s silver or white gold colour. any ideas?

  27. my ring has JB 10k

  28. I have a .925 sterling silver ring with .925 stamped on the inside and inside kn the other side it has the size stamped on it as well does that mean the ring is fake sterling silver

  29. I have a ring stamped 18K GE s/a

  30. Kelli Farrah // April 23, 2023 at 2:17 pm // Reply

    I have a diamond solitaire ring the metal is gold colored inside the band it is marked with DC what does that mean? is it real gold is the diamond real?

  31. 9ct jp146 ??

  32. 14KP JONT last letter may be C or S or c but worn .. Purchased new 87-91 Joliet IL small jewelry store going out of business. Definitely a big dome ring. Is it the store or designers initials?

  33. I have an engagement ring 10k gold with some silver and a stamp like this

  34. What’s G.3 on back of my ear ring

  35. I have a ring with what looks like two birds around a circle or octagon what is it

  36. Hi
    where can I buy the tool to make the stamp on jewellery

  37. i have a yellow gold ring with diamonds and the marks is like AK?
    or maybe its is 14k with stamp 1

  38. I have a ring with AD 750 or maybe AB 750. what does it mean

  39. wedding ring stamped 14 kt fs what does the fs stand for?

  40. Eric leighton // July 29, 2023 at 2:52 pm // Reply

    what does 18KTGE PAL mean.

  41. mine had engrave K18 0 22 D 0 07..

  42. Elvina Roberts // August 13, 2023 at 11:39 am // Reply

    18 kt PAL stamp

  43. what does the letters RJW mean behind 14k

  44. I have a ring that is stamped with H929 what does this mean

  45. G7RS what does it mean

  46. mine says 13kgersc or 13kgerst or 13kgersd the last letter is hard to make out

  47. Gaynor Christian // September 20, 2023 at 4:59 am // Reply

    I have an 18k gold ring with 1439 on it what does that mean?

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