There are many different metals used in the jewelry world, and sometimes one can look and feel exactly like another, when in reality its a cheap copy. Especially when you buy jewelry from second hand stores or flea markets, it can be unclear what metal is used in a jewelry piece, and often confuse it for another, or worst case scenario-get an allergic reaction from a cheap metal that you confused for an expensive one. 

To prevent that, in this article I will be breaking down steps of how to identify 4 different metal types if you are unsure, and want to talk about your jewelry pieces in confidence. 

The most common metals used for jewellery are gold, sterling silver, nickel and brass used mostly due to their beauty, durability, and resistance to tarnishing. These as well as the rest of the metal types differ in things like price, tarnishing, and looks, and sometimes can be confusing to identify. Below are all the most popular tests anyone can do on their jewelry pieces in the comfort of their home to find out whether or not it is valid, as well as tips for some metals on how to get rid of the tarnish if the metal is pure.

Gold

Gold is one of the most recognizable precious metals, valued for its bright color, resistance to rust, and high density. However, many metals are designed to imitate gold, so testing can help confirm its authenticity.

1st test:

• Magnet attraction

Hold a strong household magnet near the jewelry piece, if the item is attracted to the magnet or sticks to it, it most likely contains iron, nickel, or another magnetic metal and might not be pure gold. If there is no magnetic reaction, it is probably gold, although some gold jewelry contains small amounts of other metals that could produce a slight reaction.

2nd test: 

• Water Test

Pure gold always sinks quickly in water, due to it being a dense metal. Fill a small bowl or glass with water and gently drop the jewelry into it. Real gold should sink immediately to the bottom because of its weight and density. If the item floats or sinks very slowly, it may be gold-plated or made from a lighter metal.

3rd test:

• Stamp

Pure gold jewelry is always stamped with a hallmark indicating purity, and can help you quickly identify its validity. 

Common gold markings include:

• 10K- 41.7% gold

• 14K -58.3% gold

• 18K- 75% gold

• 24K-nearly pure gold

These stamps are usually located inside rings, on clasps, or on the back of pendants. Although hallmarks are helpful indicators, they can sometimes be faked, so it should be checked alongside with other tests mentioned above.

Sterling silver

Sterling silver is an alloy made from 92.5% silver and 7.5% other metals, usually copper. It is widely used in jewelry and decorative items as it has a smooth-like appearance and texture, and can easily be styled with other jewelry pieces

1st test:

• Magnetic test

Just like gold, silver is not magnetic, meaning if the metal is pure, it should not be attracted to the magnet. Place a magnet close to the item. If the jewelry sticks strongly to the magnet, it is likely made from another metal or contains other non-silver metals. A very slight attraction to the magnet may happen in some cases, but strong attraction usually means the piece is not sterling silver.

2nd test:

• Stamp 

Authentic sterling silver pieces are usually marked with a purity stamp.

Common sterling silvermarkings include:

• 925

• Sterling

• Ster

• Sterling Silver

These stamps are often found on the inside of rings, on bracelet clasps, or on the back on pendants and necklace tags. The “925” mark indicates that the item contains 92.5% pure silver, which is the standard used for sterling silver.

3rd test:

• Polish test

Authentic silver naturally oxidizes and tarnishes over time, which creates a dark residue.

Gently rub the jewelry with a soft white cloth. If the cloth leaves black or dark gray marks, it is a good sign that the item is real silver. This residue is silver oxide, which forms when silver reacts with air and moisture. Fake silver or stainless steel usually does not produce this dark residue.

~ Tip how to get rid of the tarnish ~

1. Spread aluminum foil over a glass/ceramic dish

2. Place your silver pieces on the foil, ensuring they make direct contact with it. 

3. Sprinkle  1–2 tablespoons per cup of water of baking soda over the silver.

1. Pour boiling water into the bowl until the silver is completely covered. You will see bubbles and smell a sulfur scent (similar to rotten eggs)-this is how it is supposed to be. 

2. Let the silver soak for 2–5 minutes. For heavy tarnish, you may need up to 10 minutes.

3. Remove the silver, rinse it with water, and dry it thoroughly with a soft cloth

Nickel

Nickel is commonly used in inexpensive jewelry and metal alloys. While it can resemble silver and gold, it has different physical properties. It often tarnishes, and is not recommended for long wear. Nickel is well known for causing skin allergies for many people. If a piece of jewelry leaves redness, itching, or irritation on the skin after prolonged contact, it may contain nickel. This reaction is called nickel dermatitis, and it is one of the most common metal allergies. And even though not everyone is allergic to nickel, the absence of a reaction does not necessarily mean the metal does not contain nickel. It is often found in cheap jewelry stores and flea markets, and if you want to be sure your jewelry pieces are safe, tarnish-free and will last for a long time these tests would be very useful.

1st test:

• Magnet test

Place a magnet near the jewelry piece. If the item is attracted to the magnet, there is a possibility that it contains nickel or another magnetic metal. While this test is not completely valid, it can be a good leading step if combined with other tests listed below.

2nd test:

• Appearance& Weight test

Nickel typically has a pale silver or slightly gray color with a shiny finish. Compared to sterling silver, nickel often appears slightly darker or cooler in tone. Examining the color alongside other tests can provide a better understanding of the metal. 

Nickel jewelry also often feels lighter than precious metals like silver or platinum, therefore If you compare your piece to a similar-sized silver piece, the nickel piece will usually feel a lot lighter. This is because nickel has a lower density than many precious metals. While this test alone is not definitive, it can support other observations.

3rd test:

• Vinegar test

For this test place a drop of white vinegar on a part of the jewelry piece and wait a few minutes. If the metal begins to change color or dull slightly, it may contain nickel or another metal. Precious metals like gold usually do not react to vinegar.

Although all the tests for finding Nickel in jewelry are useful, there are also affordable nickel test kits, which can be purchased via the internet and are much more reliable to detect the metal. These kits usually contain a solution that reacts with nickel. When applied to the metal surface, the solution will turn pink or red if nickel is present. This test is commonly used for jewelry, watch bands, and metal accessories.

Brass

Brass is an alloy, made from copper and zinc and is frequently used to imitate gold. Although it is more dense and darker-colored than gold, the jewelry made from brass still remains very popular as it is inexpensive, tarnish resistant and is often found in vintage jewelry sold on flea markets and second hand stores. 

1st test:

• Magnet test

Brass is not magnetic, therefore if a brass item shows strong attraction to a magnet, it likely contains iron or steel components. If there is no reaction, the piece might be brass, or another non-magnetic metal.

2st test:

• Scratch test

A small scratch can sometimes show the metal underneath, helping you identify its purity. If the item is lightly scratched in a small  area, brass will usually reveal a dull yellow or slightly reddish tone under the surface. This color comes from the copper content in brass.

3rd test:

Brass tends to tarnish over time, especially when exposed to moisture and air. Over time, brass jewelry may develop a darker appearance or a greenish tint, especially on the inside of the pieces. This green discoloration comes from copper oxidation and is a common sign that the metal contains copper, which brass does. So by seeing these reactions, you can identify if it is brass or not. 

~ Tip how to get rid of the tarnish ~

Lemon and Baking Soda (Best for Medium/Heavy Tarnish) 

1. Mix the juice of half a lemon with a teaspoon of baking soda to make a paste.

2. Apply the paste to the brass with a soft cloth.

3. For heavy tarnish, let it sit for up to 30 minutes.

4. Rinse with warm water and dry.

While these all these tests for various metals can provide helpful indications, they are not always completely accurate. Many jewelry pieces contain mixed metals or plating that can affect the results. If you need to be completely sure of the metals used in your piece, it is best to have it tested by a professional jeweler using specialized equipment.

Bibliography:

• Christine. “How to Clean Brass - 6 Tried & Tested Methods That REALLY Work.” Little House on the Corner, 24 July 2017, www.littlehouseonthecorner.com/ultimate-guide-how-to-clean-brass/. Accessed 4 Apr. 2026.

• People, Turquoise. “Found at Flea Market. Is It Valuable?” Turquoise People, 19 Oct. 2023, forum.turquoisepeople.com/t/found-at-flea-market-is-it-valuable/11385. Accessed 4 Apr. 2026.

• Sinozich, Lindsey. “Sparkling Solutions: Methods to Clean Sterling Silver Jewelry.” Fink’s Jewelers, Fink’s Jewelers, 15 Aug. 2024, www.finks.com/blogs/news-and-events/sparkling-solutions-methods-to-clean-sterling-silver-jewelry?srsltid=AfmBOoqFwjnFBfo_ry2IO3tXmnWz3As_BfdFCzzzTx5XAOHgbtbvAIMW. Accessed 4 Apr. 2026.