Understanding Gold Purity: 24K, 22K, 21K, and 18K Explained

Gold purity is measured in karats (K), with 24K being the purest form of gold. Understanding these purity levels is crucial when buying or selling gold, as purity directly affects both price and durability.

What is Gold Purity?

Gold purity refers to the percentage of pure gold in a piece of jewelry or bullion. Pure gold is 24 karats, meaning it contains 99.9% gold. However, pure gold is very soft and not practical for everyday jewelry, which is why it's often alloyed with other metals.

Gold Purity Levels Explained

24K Gold (99.9% Pure)

• Purity: 99.9% gold
• Best for: Investment, bullion, coins
• Characteristics: Bright yellow color, very soft, scratches easily
• Price: Highest price per gram

22K Gold (91.7% Pure)

• Purity: 91.7% gold, 8.3% other metals (usually copper or silver)
• Best for: Traditional jewelry, especially in Middle Eastern markets
• Characteristics: Slightly less bright than 24K, more durable
• Price: Lower than 24K but still premium

21K Gold (87.5% Pure)

• Purity: 87.5% gold, 12.5% other metals
• Best for: Jewelry, especially popular in some Gulf countries
• Characteristics: Good balance between purity and durability
• Price: Moderate premium

18K Gold (75% Pure)

• Purity: 75% gold, 25% other metals
• Best for: Modern jewelry, engagement rings
• Characteristics: Very durable, can be alloyed for different colors (white, rose gold)
• Price: More affordable while maintaining gold value

How Purity Affects Price

The price of gold is calculated using the formula: Price = (Karat/24) × Spot Price

For example:

• If 24K gold is $134 per gram
• 22K gold = (22/24) × $134 = $122.83 per gram
• 21K gold = (21/24) × $134 = $117.25 per gram
• 18K gold = (18/24) × $134 = $100.50 per gram

Which Purity Should You Choose?

• Investment: Choose 24K for maximum gold content
• Traditional Jewelry: 22K or 21K are popular choices
• Everyday Wear: 18K offers the best durability
• Budget-Conscious: 18K provides good value

Conclusion

Understanding gold purity helps you make informed decisions when buying or selling gold. Always check the karat marking on your gold items and use our gold calculator to determine the exact value based on current market prices.