If you are thinking about selling gold jewelry in St. Louis, one of the first questions you may have is: How do jewelers know how much my gold is worth? Professional gold buyers and jewelers use several testing methods to determine whether an item is real gold, how pure it is, and what its actual market value may be.

Gold testing is an important step because jewelry can look similar on the outside while having very different values. A 10K gold ring, 14K gold necklace, and 18K gold bracelet may all appear identical, but the amount of pure gold inside can vary significantly. At St. Louis Gold Buyers & Jewelry Center, every piece is carefully evaluated to determine its gold content, weight, and value before making an offer.

Why Is Gold Testing Important?

Gold is measured by purity, which is represented in karats.

Common gold markings include:

• 10K gold – 41.7% pure gold
• 14K gold – 58.3% pure gold
• 18K gold – 75% pure gold
• 22K gold – 91.7% pure gold
• 24K gold – nearly pure gold

The higher the karat number, the more pure gold the item contains.

However, markings inside jewelry are not always enough. Stamps can become worn, altered, or sometimes falsely represented. That is why professional gold buyers use additional testing methods.

Common Methods Jewelers Use to Test Gold

1. Visual Inspection and Hallmark Checking

The first step in gold testing is examining the jewelry itself.

Jewelers look for markings such as:

• 10K
• 14K
• 18K
• 22K
• 24K
• 585
• 750
• 916
• 999

These numbers indicate the purity level of the metal.

For example:

• 585 = approximately 14K gold
• 750 = approximately 18K gold
• 999 = nearly pure gold

Jewelers also inspect the piece for signs of:

• Gold plating
• Gold filling
• Repairs
• Wear patterns
• Discoloration

2. Magnet Testing

A simple test some buyers use is checking whether a piece reacts to a magnet. Pure gold is not magnetic. If jewelry strongly attracts to a magnet, it may contain other metals. However, magnet testing alone cannot determine whether gold is real because many non-magnetic metals can also imitate gold. Professional buyers, like ourselves, use more accurate testing methods.

3. Acid Testing

Acid testing is one of the traditional methods used to check gold purity.

A small sample from the jewelry is tested against different strengths of acid to determine how the metal reacts.

This helps identify whether the piece is:

• 10K
• 14K
• 18K
• 22K
• Or another metal

Experienced professionals perform this test carefully to protect the jewelry.

4. Electronic Gold Testing

Many modern jewelry buyers use electronic testers that measure how the metal conducts electricity.

This allows professionals to quickly estimate gold purity without causing damage to the item.

Electronic testing is commonly used for:

• Rings
• Chains
• Bracelets
• Earrings
• Gold coins

5. X-Ray Fluorescence (XRF) Testing

Some professional buyers use XRF technology, which provides a detailed analysis of the metal composition.

XRF testing can identify:

• Gold percentage
• Silver content
• Copper alloys
• Other metals

This technology helps provide a more complete picture of what a jewelry piece contains.

How St. Louis Gold Buyers & Jewelry Center Tests Gold

At St. Louis Gold Buyers & Jewelry Center, we believe customers should understand exactly how their jewelry is evaluated.

When you bring in gold jewelry, our team examines:

✔ Gold purity
✔ Weight
✔ Current gold market prices
✔ Condition of the piece
✔ Additional value from diamonds or gemstones

We buy many types of gold items, including:

• Gold rings
• Gold necklaces
• Gold bracelets
• Broken gold jewelry
• Gold coins
• Estate jewelry
• Scrap gold

Our goal is to provide a transparent evaluation so customers know why their item has value.

Can You Tell If Gold Is Real at Home?

There are some simple tests people try at home, but many are unreliable.

Common home tests include:

• Magnet tests
• Looking for stamps
• Float tests
• Scratch tests

While these may provide clues, they cannot accurately determine the true gold content or value.

A professional evaluation is the best way to know what your gold is worth.

Before You Sell Gold in St. Louis, Know What You Own

Understanding how jewelers test gold can help you feel more confident when selling unwanted jewelry.

Whether you have old gold rings, broken chains, inherited jewelry, or pieces you no longer wear, professional testing ensures your offer is based on the actual value of the item.

If you are searching for “gold buyers near me” or looking for a trusted place to sell gold in St. Louis, visit St. Louis Gold Buyers & Jewelry Center for a professional evaluation.

We make the process simple, transparent, and easy to understand.