What do we buy?

We buy almost any metallic material that contains gold, silver, or platinum, including but not limited to:

  • Karat gold jewelry scrap such as rings, chains, charms, earrings, pendants, any broken gold jewelry, and any other gold jewelry item.
  • Dental gold alloy scrap such as bridgework, inlays, crowns, and other gold dental work.
  • Other gold alloy scrap such as coins (including foreign coins), bars and medallions
  • Platinum jewelry scrap such as rings, chains, charms, earrings, pendants, and any other platinum jewelry.
  • Silver items such as jewelry, flatware, cups, plates, platters, candlesticks, silver electrical contacts, and any other silver items.

* Please note that we are not gemologists and do not price out or purchase gemstones. The prices we quote are for precious metals only.

How do I know if something is gold, silver, or platinum?

The vast majority of items made from precious metals are marked in some way stating what material they are made with. A quick way to find out if your items are not made of precious metals is to test them with a very strong magnet. If the items are magnetic they are not made of a precious metal but remember that just because it is not magnetic does not mean that it is made from a precious metal. For more information on stamps and markings of jewelry and other items please see our Stamps & Markings Guide.

Why should I sell local instead of using an online service?

When you go to a local shop you can get that face to face interaction that you just can’t get with an online shop.  You can also get quick and fast evaluation of your items and prompt on the spot payment without having to deal with packing and shipping your items, waiting for the evaluation of what you send, then having to deal with negotiating over the phone or email with someone you can’t even see.  Not to mention the long drawn out process of dealing with insurance should your package get lost in the mail.

How do I know I’m getting the best price?

As with anything else in life doing your homework and knowing what you are selling is top priority. If however, you don’t have the time to do the necessary research the experts at Granite State Gold & Coin are happy to explain to you what you have, what it means and what the value is and most importantly how we came to that value. Our mission is not only to provide you a safe and reputable place to sell your precious metals it’s also to help educate and answer your questions.

Do you purchase gemstones?

While we are experts in the purchasing of precious metals we ARE NOT gemologists and can not quote you on the value of any stones that may be in your rings.  When coming to Granite State Gold and Coin we recommend that you have all stones removed by a jeweler or yourself.  We will also provide you with a place for you to remove and take your stones with you if you wish after discussing the value of the metal of your rings, pendant or necklaces.

Is my precious metal real or fake?

A guide to interpreting stamps and markings

Many of our customers ask us how we can tell if something is gold before we do any tests. For the trained eye fake metals can usually easily be spotted but there are a few things you can look for to help determine whether your item is made from precious metals.

One of the first things we look for when sorting jewelry is whether any of the items are magnetic. There are only three magnetic elements which are iron, nickel, and cobalt. If an item is magnetic it is because it consists primarily of one of those three elements which more often than not is iron. So the easiest way to sort through a lot of jewelry is to use a very strong magnet to weed out all the magnetic items. There are exceptions to this rule; if an item is clearly marked, for example 14K, 10K or 925 but is still magnetic you should set it aside and have it evaluated but an expert.

Once we have removed all the magnetic items from the pile we then look for stamps and markings on the items. Nearly all precious metal jewelry has a mark of some kind. On chains the marking is usually on the clasp or right next to the clasp and on rings the markings are on the inside of the ring. Often times, people find the stamp but don't know what the stamps mean. We will go through each precious metal and list the most common stamps for different grades of gold.  Please keep in mind this is not a complete list of stamps just the most common.  Also keep in mind just because it is stamped doesn’t mean it is real either as people can purchase stamps online and stamp items that are not what they are supposed to be.


Many people know the most common stamps like: 10K, 14K, 18K and so on but sometimes there are 3 numbers marked instead of a karat grade. The three numbers you might see are actually just a decimal number representation of the karat grade of the item. Since 24 karat is the most pure (24 parts out of 24 parts are gold) we can then figure out the percentage of gold in the other karat grades. So now we know a 10 karat piece is 10/24ths gold. 10 divided by 24 is 0.417 or 41.7% gold. This percentage is often times marked as three numbers on a 10K gold ring, 417. The same is true for all other karat grades.

  • 8K or 333
  • 9K or 375
  • 10K or 417
  • 12K or 500 (12 karat is uncommon and usually gold fill)
  • 14K or 585
  • 18K or 750 (18 karat gold is marked 750 most of the time)
  • 20K or 833 or 830
  • 21K or 875
  • 22K or 916
  • 23K or 950
  • 24K or 999 or 9999

Sometimes the karat stamp will be followed by other letters such as P, GP, HGE, RGP, and GF.
These stamps mean:

  • P after the stamp like "14KP" means 14 Karat plumb. The reason this is marked this way is to tell you that there is exactly 58.5% gold in the item. Not all 14 karat pieces are plumb 14 karat. As long as the item is higher than 13 karat or 54.2% gold the jeweler can legally mark the item 14 karat.
  • GP after the stamp stands for gold plated, "18K GP" means the item is electroplated with 18 karat gold.
  • HGE stands for "High Grade Electroplate," "18K HGE" meand the item is electroplated with 18 karat gold.
  • RGP means "Rolled Gold Plate" Often seen as "10K RGP" or "1/30 10K RGP"This term is usually stamped on watches and is basically a very thin layer of gold bonded to a base metal. This type of piece has more gold than an electroplated piece has but it is still not solid gold.
  • GF stands for gold filled. It can be marked as "10K GF" "1/20 10K GF" Sometimes the piece is not marked with GF after the stamp but only "1/10 14K" this also means gold filled. Gold filled items are similar to RGP items in that the gold is in a thin layer bonded to the surface of a base metal. The fraction before the karat grade refers to how much gold is actually in the item. "1/20 10K GF" means 1/20th or 5% of the weight is 10 karat gold. If you see a marking of 12K on an item it is almost always gold fill.


Many people think the term "Sterling Silver" means pure silver. This assumption is incorrect. Sterling silver refers to the purity of the silver. Sterling silver is 92.5% silver and 7.5% copper. The alloying of a small amount of copper with the silver makes the sterling silver tarnish a little more slowly and makes the metal harder and more durable than pure silver. For the most part, silver stamps are very simple and straight forward. Much like with gold, silver will be marked with a three number stamp. 

  • 925 or sterling or ster. will be marked for sterling silver items. As stated above the 925 stands for 92.5% silver
  • 900 is less common but means 90% silver. Alloys of 90% silver are usually referred to as coin silver like the U.S. dimes, quarters, and half-dollars from 1964 and earlier. Flatware is almost always marked "Sterling" and not 925. 
  • 800 is also uncommon and is a fairly low grade alloy of silver. It usually will not be as white in color as sterling or pure silver.
  • British markings for silver are called hallmarks. They are very tiny pictures stamped on silver items like cups, bowls, plates, etc. The British mark for silver is a left-facing lion with one paw raised. 
  • Nickel Silver, German Silver, Brazil Silver, Montana Silver, and other _______ Silver markings refer to an alloy of nickel and copper to create a silvery colored metal. These items are very common and you must be careful when purchasing these because the word silver in the marking is only referring to color and not the element silver. 

Flatware is almost always marked Sterling if it is a solid silver piece. 99% of the time if there is not a stamp that says "Sterling" somewhere on the piece the item is just silver plated.



Platinum is a very rare metal and is very expensive to make into jewelry because of it's high melting point. There are typically only two different grades of platinum that are made into jewelry but there are still quite a few stamps for them. Keep in mind, when cobalt is used in the alloy, it will likely be magnetic. 

  • Pt 900 or Plat 900 or Plat or 90/10 Pt/Ir or 900 Pt 100 Ir or Platinum, these markings refer to the most common alloy of platinum which is 90% pure. The other 10% is most commonly iridium which is added to increase the hardness and thus durability of the platinum. Sometimes the alloying metal is ruthenium or even cobalt because they provide an even more durable alloy.
  • Pt 950 or Plat 950 or 95/05 Pt or 950 Pt 05 Ir, these markings refer to a slightly more pure alloy. The other metal in this alloy is most commonly iridium but also ruthenium and cobalt as well. 

We hope this helps you decipher some of the stamps you saw on your pieces. If you have any questions or comments please feel free to let us know!