Next day shipping on selected items!

Marks Stamped Inside Rings

on June 22, 2024

Some jewelry has special marks and symbols that serve to summarize the information of the item in question: manufacturer, metal, gemstones, weight, origin... These marks stamped on the metal are usually more evident on rings, almost always on the inside of the band, but what exactly do they mean?

Let's see how to interpret these symbols and their meanings, something that may be useful to you now or in the future.


Context about the stamps on rings

As we mentioned at the beginning, the markings on rings usually refer to the type and weight of both metal and gemstones, manufacturers and trademarks. This is particularly useful in determining which of a group of jewelry is of a certain level of quality.

As they come to market, the hallmarks allow you to trace the manufacturer or reference the quality of the design for potential secondary trade.

It is important to be clear that there are as many symbols as there are manufacturers, distributors and artisans. In addition, each one has his own signature and manages his personal standard. Although there are pages dedicated to registering these special stamps, there are also many unknown figures, which is normal in this context.


Metal identification by ring stamp

One of the main values usually found on these jewelry hallmarks is the type of metal along with its percentage of purity expressed in carats. The metals that we will normally find in jewelry and their respective indicator can be:

  • Platinum: PT - PLAT
  • Stainless Steel: S.S. - St - Steel
  • Sterling Silver: Sterling - 925 - .950
  • Titanium: Titanium
  • Tungsten: Tungsten
  • Palladium: Pd - Pall
  • Gold Plated: GP
  • Gold Filled: G F
  • Gold: (number between 9 and 24)K - (number between 9 and 24)karats

This is usually the standard in U.S. jewelry, but please note that imported jewelry may have modifications to these abbreviations.


Carat weight of the metal

Gold is a very beautiful metal, but it is too soft to be used completely pure in jewelry. For this, it is combined with other metals that can give it a more workable, resistant and durable consistency. Depending on how many parts of gold and parts of metal make up a piece of jewelry, carats are established.

  • 24-karat gold is completely pure gold, with no other metals.
  • 20-karat gold is 20 parts gold with 4 parts of other metals. 20/24 (83.33% gold)
  • 18-karat gold is 18 parts gold with 6 parts other metals. 18/24 (75% gold)
  • 14-karat gold is 14 parts gold with 10 parts other metals. 14/24 (58.33% gold)

The lowest portions of gold traded in fine jewelry pieces are usually 14-karat gold and is reflected in rings stamped 14k. Another way to reflect the amount of gold can be with the percentage of purity. .833 is 20-karat gold, .750 for 18-karat gold and so on.


Weight of center gems

When dealing with diamonds or gemstones of considerable size, it is normal to see a stamp with the weight of the center gemstone. In the case of having complementary side diamonds, these are also included. The common abbreviation is usually a dot, followed by the carat weight.

Let's take some examples. If you have a ring with a 55-carat center diamond, a common stamp will be ".55". Sometimes, the number may be accompanied by a weight identifier, such as:

  • Carat Weight (cw): .55cw
  • Carat Weight (ct): .55ct
  • Total Diamond Weight (tdw): .55tdw

Curious note: If a stone has "CZ" after the weight, it usually refers to the fact that the center stone is not a genuine diamond but a Cubic Zirconia.


Marks of the manufacturer, artisan, distributor and patents

At this point things can get complicated. In addition to the basic hallmarks for precious metals and gemstones, a ring may have a hallmark that identifies a jeweler, a manufacturer or a special patent. Some of these hallmarks are easy to recognize, such as Tiffany's << T & CO>> and others are a mystery.

- The jeweler's hallmarks usually reference the retail store where the ring is first purchased.

- The large-scale manufacturer affixes its hallmark because it represents a competitive advantage and gives value to its jewelry.

- When a gemstone has a special cut or is set in a unique configuration, the metal must bear the patent stamp.

- The jewelry designer's stamp refers to the artist, especially on custom jewelry.

Any ring, stamped with its metal content, must by obligation include some brand stamp to endorse it.


Diamond symbol inside ring band

Many of our frequent readers have (secretly) asked us about a particular stamp, and we hope you find this information useful. The Diamond symbol inside ring band has been present in the works of several brands.

Some are stamps from wholesale distributors who often supply various stores, including military both inside and outside the USA, and place the initials next to a diamond.

It is quite possible to get classic models (1930-1950) with stamps of this type.


Legal conditions on the use of hallmarks in jewelry

As for legal regulations, few rules oblige suppliers to hallmark precious metals. Although it is not an imposition, it is important that they comply with three fundamental requirements:

  1. The characteristics of the metal must be clearly notified to the consumer. A signed documentation, a descriptive invoice, an appraisal, a security label or stamping is valid for this purpose.

  2. If the metal is stamped as a form of notification of the contents, the trademark stamp or the stamp of the supplier (the store) must be included.

  3. The regulation is mandatory for Platinum, Gold and Silver.


Reliability of hallmarks stamped on metals

Are the markings on the metal totally reliable? No.

Marks can deteriorate over time or with improper treatment of the metal. Some maintenance actions, such as polishing the band, may cause some lettering to be lost or not very distinguishable.

In case of second-hand rings, it is impossible to be sure that a stone has not been altered, even if the band claims to be a ".90" diamond.

To avoid this, prefer first-hand suppliers who assure you that they stand behind their investment and the authenticity of their materials. If you are still considering secondhand jewelry, make sure it is professionally cut and don't just rely on the hallmark.



  • What do hallmarks on rings mean?

    Hallmarks, also known as assay marks or punches, indicate the metal purity and quality of a ring. For example, marks like "14K," "18K," or "925" represent the amount of pure gold or silver present in the alloy. These marks guarantee the ring's authenticity and value.

  • How do I figure out what my jewelry markings mean?

    Identifying jewelry markings may require the use of a magnifying glass to see them clearly. Look for discreetly engraved symbols, numbers, or letters on the metal. These marks can indicate metal purity, place of manufacture, the jeweler or company responsible, and even dates or other significant codes.

  • Do all genuine rings have markings?

    Not all authentic rings have markings, but most fine jewelry crafted by reputable jewelers or companies will bear some form of hallmark or stamp. These serve as an indication of their craftsmanship and pride in their work. However, some antique or handmade pieces may not have visible marks.

  • Should my gold ring have a hallmark?

    Yes, genuine gold rings typically feature a hallmark indicating the purity of the gold. For example, "14K" for 14-karat gold or "AU 585" for 14-karat gold (58.5% pure gold). These marks guarantee the precise metal composition and quality.

  • What do the markings on the inside of rings mean?

    As mentioned earlier, markings on the inside of rings can indicate a variety of things. They may represent metal purity, the jeweler or manufacturing company, place of origin, or even dates or other special codes. These discreet marks are like a secret language, telling the story and origin of the ring.

by Theresa Larson on May 15, 2023

What does NVC 10 stamped on a 925 ring mean ??

by April on May 15, 2023

I have a gold ring with a purple stone my grandma said it was vintage but I’m not sure. Hopefully you can tell me what the letters on the inside mean. MDF is stamped inside the band

by Brandy Radcliffe on May 15, 2023

I have a ring that is stamped 10KO ZRW. What does the O stand for???

by Kristen on May 15, 2023

What does BY mean on a ring. I can not find it anywhere

by Michael on May 15, 2023

What does the word plexico mean’its stamped on the inside of my ring ?

by Rex Brannon on May 15, 2023


by Deanna on May 15, 2023

HI! What does S265 mean on the inside of my silver ring?

by Renee on May 15, 2023

What does the letters SU stand for inside a 1970 High School class ring

by Joe Ditcharo on May 15, 2023

I was wondering what did the Letter (DI), followed by a diamond symbol 14K mean? It is on the inside of a diamond ring… Most of it is self explanatory, but the DI has me perplexed… I’m guessing the D is indicating the type and quality of the diamond, which would be a rare colorless diamond. But what is the letter I? Thank you for any help you may be able to provide…

by Robert Lowdermilk on May 15, 2023

I have a sliver class ring I found that has a rhombus (diamond) Hallmark that’s looks like it has four dots inside of it. One in each corner. I haven’t been able to find it anywhere online so I’m asking if you might know what it is

by Donna on May 15, 2023

I have a 925 with tggc is it worth anything.

by Katie on May 15, 2023

I have a ring it does not have any types of crystals, but it is very detailed in the making of it and it has the number seven where the top is and a PREC7. I was wondering if you could help me figure out who or what this means. Thank you for your time.

by John Wiseman on May 15, 2023

Have you ever seen a stamp that says 23 L….no idea what it is …thanks in advance

by Lia on May 15, 2023

If I send a picture of the marking inside my ring can you help interpret it?

by Rita on May 15, 2023

I have a ring that has mw114k stamped in it. Can anyone tell me what this stamp means.

by Joshua cullen on May 15, 2023

I have a ring and it has a (11) stamped inside the band and Noone can tell me what it means

by Leslie on May 15, 2023

I found a ring and on the inside marked on either side it says INDIA, what does this mean about the ring other than it may be from India. Thank you for your time.

by Robin compston on May 15, 2023

14k ZEI
What does this mean

by Robin on May 15, 2023

Recently purchased a second ring with an unusual stamping inside. Can’t find any info on it. It is stamped USD with 6 numbers following, and the letter S at the end. Any ideas on what this means?


by James Norred on May 15, 2023

What does 9 AU stamped on a ring mean?

by Brenda on May 15, 2023

I have to symbols on the inside of my rang. It’s supposed to be a real diamond, but not sure.

by annie on May 15, 2023

I received a ring that appears to be yellow gold and diamonds. But I am fairly sure it is not real, the stones have very little color. The only stamp in the ring is STER. that is it, nothing else. Is this sterling silver with gold plating? Or is STER some kind of store/manufacturer stamp?

by Erika on May 15, 2023

What does 1414s mean on the inside of a genuine diamond ring mean?

by Kimberly Jackson on May 15, 2023

Hello Ivhave a old silver and blue topaz and inside th ring is stamped NA I was wondering if you could tell me what that ment? There is no .925 or 10k etc.
Thank You,
Kimberly j

by Mindy on May 15, 2023

I have a thin gold, rounded band that has 18 small round diamonds, arranged in a half eternity band style. Inside of the ring is printed “14K 585 41” on one side and “D0.18”. I understand that the “14K 585” is the gold value and the other is the total carat weight of the diamonds but what is the “41”? This is the one thing that is turning out to be impossible to find.

by Lynn Seawright on May 15, 2023

I have a 18k Rolex men’s ring , but it is stamped on the inside under the crown or head of the ring on upper part inside so is it real or fake ? Much Thanks

by Tom Dauenhauer on May 15, 2023

Inside of my ring is stamped soc, do you know what it means?

by Ruben Murguia on May 15, 2023

Very informative but my question was WT1 what does this mean. Thank you

by Kenny Shelly on May 15, 2023

I received a ring that has, what appears to be a 69 stamped on the inside of the ring, what does it mean


Please note, comments must be approved before they are published


Net Orders Checkout

Item Price Qty Total
Subtotal $0.00

Shipping Address

Shipping Methods