5 Things You May Not Know About Gold-Filled

Learn the ins and outs of gold-filled for jewelry making.

Watch our Halstead Jewelry Minute Gold-filled 101 video for detailed information on gold-filled material construction, gold layer alloy components and more. The video has different content than the text below so be sure to check it out!

A lot of new jewelers have some misconceptions about gold-filled jewelry supplies. If you are selling gold-filled items it is important to understand the product so you can accurately describe it to customers and handle it properly. Here are five common questions we get about gold-filled. But, first a little bit of information about the material.

Gold-filled ConstructionGold-filled is constructed in two or three layers. The core metal is usually jewelers’ brass; though in the past, sterling silver was sometimes used instead. Single clad gold-filled has all the gold content in a single layer on one side. Double clad gold-filled splits the gold content into surface layers on both sides of the material. The gold alloy is then bonded to one or both surfaces of the brass core with heat and pressure. The bonded raw material is then sold as sheet or wire to jewelry manufacturers for use in designs.


Gold-filled is legally required to contain 5% or 1/20 gold by weight. This 5% is then described by the karatage of the gold alloy. Most gold-filled is 12kt or 14kt gold-filled. It is most accurately labeled with the karatage, the “/” symbol, and then 20 to reflect this construction. Products are identified as 14/20 Gold-filled or 12/20 Gold-Filled; alternatively, 14kt Gold-Filled or 12kt Gold-Filled are also acceptable.

Halstead: Gold-Filled Items

1. Why can’t you stock more of your cast charms in gold-filled?
Gold-filled cannot be cast. This is a major limitation in the types of products that can be manufactured in gold-filled. Products must be made from sheet, tube or wire that retain the layers constructed in brass and gold. Casting by definition is melting the metal material which would alloy the layers into one big melted mess.

2. Why don’t you stock gold-filled solder?
First, there is no such thing as gold-filled solder. Your best bet is to color match the solder joint to the surface metal by using 14kt gold solder. Second, we do not recommend soldering gold-filled without specific equipment and specialized training on gold-filled soldering. Most gold filled soldering at the manufacturing level is done with laser welders that make precision joints. If you attempt to solder gold-filled with a torch and normal gold or brazing solder you will alloy the gold surface layer of gold-filled with the brass beneath it and leave a dark solder joint that will be markedly different than the neighboring gold. The exposed brass joint will quickly tarnish to black and be even more distinct. The only way to repair it at this point is to plate the entire item in gold to cover the joint and match color all over the piece. Similarly, you should not sand or file gold-filled since you will remove the gold portion of the product and decrease the surface layer integrity.

3. I need the gold item XYZ…
OK, this one isn’t a question but it raises an important issue. Some jewelry designers will refer to gold-filled items as just “gold.” It is not gold and it is illegal to call gold-filled items gold, which implies they are a solid alloy with much higher pure gold content. Gold-filled is a unique material and must be clearly distinguished from solid gold by professionals in the industry. “Gold” is not an acceptable short hand and it can get you in legal trouble for fraud. Don’t get in this bad habit.

4. Is gold-filled the same as gold plate?
No, gold plating is a miniscule layer of solid gold applied to a brass base. The plating does not compose any measurable proportion of the product’s total weight. It is estimated to be 0.05% or less of the metal product. Gold plating will wear off rather quickly and expose the brass base product. It does not stand up to heat, water or wear over time. By comparison, gold-filled contains 5% gold by weight; moreover, all the gold is on the surface which offers product protection from tarnish and wear.

5. Can gold-filled tarnish?
Yes it can, but it takes a rare set of circumstances. Gold-filled is usually a lifetime product because the gold layer bonded to the brass core is quite thick. However, in rare instances of extreme sulfide exposure the gold-filled can blacken. This has only occurred a handful of times over our decades of gold-filled use. Foreign transit through extremely polluted shipping docks in a few countries has caused the product to blacken on several occasions. The only domestic cases we have had were products stored in nail salons with high levels of chemical sulfide fumes and due to a fire where the structure was filled with smoke and all the gold-filled in the building turned black. These are extreme conditions that are unlikely to happen to most end users. However, it has made me think twice about breathing the air in nail salons.  Usually, gold filled just requires light surface cleaning with an untreated cloth or mild soapy water.

6. Can you be allergic to gold-filled?

Individuals who have skin reactions with gold alloys will also react to the gold alloy layer on the surface of gold-filled. Some people’s body chemistry will cause their skin to blacken or develop a rash when they wear certain metals. I am one of those people and on certain days, my fingers will turn black all around my 14kt wedding band. Rarely, an individual’s body chemistry may darken the metal as well.

Gold-filled is a reasonably priced, quality alternative to solid gold. Most gold-filled items are made in the USA. We offer a wide selection of gold filled chain, charms and findings to outfit your jewelry studio with plenty of materials for gold-filled jewelry design.

Halstead Bead

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  • I bought a 14k gold filled mairner chain and in between the chain links i can see the base metal. Is the chain just gold plated? It is stamped14kB, gold bonded. Idk if it was gold filled but they had to file it in those areas to make the chain. Or if it was just dunked in gold plating?

    • Hi Tim. I would suggest contacting the vendor you purchased the chain from. They would be able to tell you the process used on that specific one.

    • Hi, Lisa. Gold-filled pieces should be marked, but if it’s not you should take it to a professional jeweler to have it tested.


    • Hi, Jack. Gold-filled jump rings come both open and closed. The gauge of the jump ring is useful to know especially if you’re hanging a heavy charm to it. You can purchase hard snap jump rings to provide extra protection.
      Hope that helps!

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