Gold Purity Chart Explained: 10K, 14K, 18K, 22K, 24K — What Sellers Need to Know

When you pick up a piece of gold jewelry, the small stamp inside the band or on the clasp tells you more than most people realize. That tiny number followed by a “K” is your gold purity indicator, and it directly determines how much your gold is worth. Whether you are looking to sell gold, purchase a new piece, or simply understand what you already own, the gold purity chart is your most essential reference. At JS Diamonds Inc, we assess gold at every karat level with transparent, fair pricing backed by decades of expertise in the New York diamond and gold market.

This comprehensive guide breaks down each karat level from 10K through 24K, explaining gold content percentages, durability characteristics, typical use cases, and how purity affects resale value. By the end, you will have the knowledge to make confident decisions whether you are buying fine jewelry or planning to sell gold in NYC.

1. What Is Gold Purity and Why Does It Matter?

Gold purity refers to the proportion of pure gold in a metal alloy. Because pure gold is naturally soft and malleable, it is almost always combined with other metals such as silver, copper, nickel, or zinc to improve strength and workability. The resulting alloy is what most consumers interact with in the form of rings, necklaces, bracelets, and earrings.

Purity matters for several reasons. From a financial standpoint, the higher the gold content, the greater the intrinsic melt value of a piece. From a wearability standpoint, lower karat alloys are harder and more resistant to scratching, making them practical for everyday jewelry. From an aesthetic standpoint, higher purity gold has a deeper, richer yellow hue that many buyers find more appealing.

Understanding purity is especially important when you plan to sell gold jewelry. Buyers calculate offers based on the actual gold content, not the total weight of the piece. A 20-gram bracelet stamped 10K contains only 8.3 grams of actual gold, while the same weight bracelet in 18K contains 15 grams of gold. That difference translates directly into a substantially different cash offer.

2. The Karat System Explained

The karat system divides pure gold into 24 equal parts. Each unit of karat represents one part out of 24. So 24K gold contains all 24 parts as pure gold, meaning it is 99.9% pure. Meanwhile, 18K gold contains 18 parts gold and 6 parts other metals, equating to 75% gold purity.

The Fineness System: An Alternative Notation

Many gold pieces, particularly those manufactured in Europe, Asia, or the Middle East, use a three-digit fineness number instead of a karat stamp. This system expresses purity in parts per thousand. Common fineness marks and their karat equivalents are as follows: 999 corresponds to 24K, 916 corresponds to 22K, 750 corresponds to 18K, 585 corresponds to 14K, and 417 corresponds to 10K. When you bring a piece to our gold buyers in NYC, our team is trained to read both systems accurately.

3. 10K Gold: The Most Durable Everyday Option

10K gold contains 41.7% pure gold, making it the minimum karat that can legally be sold as gold jewelry in the United States. The remaining 58.3% consists of alloy metals, which significantly hardens the metal and increases its resistance to wear and scratching.

Who Buys 10K Gold?

10K gold is commonly found in budget-friendly fashion jewelry, school rings, promise rings, and children’s jewelry. Its lower gold content makes it more affordable while still carrying the prestige of being genuine gold. However, it is worth noting that the higher proportion of base metals can cause skin reactions in individuals with metal sensitivities, particularly to nickel or copper.

When it comes time to sell old gold, 10K pieces fetch the lowest price per gram among standard jewelry karats because of their lower gold content. That said, if you have a large volume of 10K gold, the total payout can still be meaningful. JS Diamonds Inc accepts 10K gold and offers a transparent calculation based on the live spot price.

4. 14K Gold: America’s Favorite

14K gold is by far the most popular karat in the United States, accounting for the majority of fine jewelry sold domestically. It contains 58.5% pure gold and 41.5% alloy metals, striking an ideal balance between durability, affordability, and gold content.

Why 14K Dominates the US Market

The alloy composition of 14K gold makes it hard enough to withstand daily wear while still maintaining a warm, attractive gold color. It is suitable for engagement rings, wedding bands, everyday necklaces, and earrings. Because it contains more than half pure gold, it also retains a meaningful portion of its intrinsic melt value.

For sellers, 14K gold pieces are among the most commonly brought into gold jewelry buyers in NYC. The high volume of 14K pieces in circulation means buyers like JS Diamonds Inc handle this karat constantly and can offer fast, accurate assessments. If you are planning to sell your gold, 14K pieces are straightforward to value and easy to liquidate.

5. 18K Gold: Premium Quality and Rich Color

18K gold contains 75% pure gold, which gives it a distinctly richer, deeper yellow color compared to 10K or 14K. It is widely used in high-end jewelry brands, fine designer pieces, and luxury engagement rings. The 25% alloy content is sufficient to provide reasonable durability while keeping the gold content at a premium level.

18K in Fine Jewelry and Luxury Brands

Most prestigious European and international jewelry houses, including Cartier, Van Cleef and Arpels, and Tiffany and Co., predominantly use 18K gold in their collections. If you own branded jewelry pieces, there is a strong chance they are stamped 18K or 750. These pieces carry both an intrinsic gold value and a brand premium that can significantly increase their resale worth.

When you bring 18K gold to our gold store in NYC, our experts evaluate both the metal content and any additional value attributed to craftsmanship or brand. If you are considering a jewelry trade-in upgrade, 18K pieces typically generate the strongest offers and can be applied directly toward a new purchase.

6. 22K Gold: Traditional and High-Purity

22K gold contains 91.7% pure gold and is among the highest purity levels still used for wearable jewelry. It is particularly prevalent in South Asian, Middle Eastern, and Indian jewelry traditions, where high gold purity is culturally significant. Wedding jewelry, ceremonial bangles, and traditional necklaces from these cultures are commonly 22K.

Durability Considerations for 22K

Because 22K gold is so close to pure, it is relatively soft and can show scratches and dents with regular wear. It is better suited for occasional or ceremonial use rather than daily-wear pieces. However, its high gold content makes it exceptionally valuable from an investment and resale perspective.

Sellers with 22K gold pieces should know they are holding some of the highest-value jewelry by weight on the market. When you sell gold for cash at JS Diamonds Inc, our team will accurately assess 22K pieces using calibrated testing equipment, ensuring you receive a fair offer reflecting the actual gold content.

7. 24K Gold: The Purest Form

24K gold is 99.9% pure gold with virtually no alloy content. It has the deepest, most vibrant yellow color of any gold form and is the international benchmark for gold trading and investment. However, its softness makes it impractical for most jewelry applications.

Where 24K Gold Is Commonly Found

24K gold is primarily found in investment-grade gold bars and coins, such as the American Gold Eagle, South African Krugerrand, and Canadian Maple Leaf. It is also used in electronics manufacturing for its excellent conductivity and resistance to corrosion, as well as in certain medical and dental applications.

If you hold 24K gold bars or coins and are ready to liquidate, JS Diamonds Inc accepts gold coins and bars with competitive, transparent pricing. Our assessments are based directly on the live spot price, with no hidden deductions.

8. Gold Purity Comparison Chart

The following table summarizes the key differences across all standard karat levels to give you a complete reference for gold purity:

9. How to Identify Gold Karat Stamps

Before you can use the gold purity chart to assess your jewelry, you need to locate and read the karat stamp. Stamps are legally required on gold jewelry sold in the United States and most other countries, though older or handmade pieces may lack them.

Where to Look for Stamps

On rings, check the inside of the band. On necklaces and bracelets, inspect the clasp or a tag near the clasp. On pendants, look at the back near the bail. Earrings may have a stamp on the post or the back plate. You may need a magnifying glass to read the small engravings clearly.

What to Do When There Is No Stamp

Unstamped gold is not necessarily fake or low quality. Antique pieces, custom handmade jewelry, and items from certain countries may not carry visible stamps. In these cases, professional testing is the only reliable method of determining purity. JS Diamonds Inc uses acid testing and electronic gold testers to accurately verify purity on any piece, stamped or not. Visit our What We Buy page to learn more about what types of gold we assess.

10. How Karat Affects the Value When You Sell

When you sell gold, buyers pay based on the actual gold content of your piece, not its retail price, sentimental value, or original purchase price. The formula is straightforward: take the weight in grams, multiply by the percentage of gold content for your karat, then multiply by the current spot price per gram.

A Practical Calculation Example

Suppose you have a 14K gold necklace weighing 10 grams. The gold content is 58.5%, so the pure gold content is 5.85 grams. If the current spot price of gold is $90 per gram (for illustrative purposes), the melt value of your necklace is approximately $526.50. A reputable buyer will offer a percentage of this melt value, typically between 70% and 90%, depending on their overhead and business model.

For a detailed breakdown of how to calculate your gold’s worth, read our guide on how much your gold is worth. JS Diamonds Inc always shows its full calculation, so you know exactly how your offer is derived. You can also learn more about gold jewelry as an investment asset to understand the broader financial picture.

Trade-In vs. Straight Cash Sale

If you plan to use your gold’s value toward a new purchase, a trade-in often yields better overall value than a straight cash sale. Our guide on trade-in vs. cash sale for jewelry explores both options in depth. JS Diamonds Inc offers both pathways, and our team can help you determine which route makes the most financial sense based on your goals. We also offer a dedicated jewelry trade-in and upgrade service for customers looking to apply their gold value toward new fine jewelry.

11. JS Diamonds Inc Serves Customers Nationwide

JS Diamonds Inc has built a reputation for honest, expert gold buying across multiple cities and neighborhoods. Whether you are located in Manhattan, Brooklyn, New Jersey, Chicago, or beyond, our team is equipped to assess and purchase your gold at any karat level. Below are some of our key service locations:

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