As a jewelry designer, your choice of metal is the foundation of your work. It influences not only the aesthetics and durability of the piece, but also its price and the perception of your brand. At La Fille du Sud , we know this decision is crucial. That's why we offer this comprehensive guide to demystify the difference between 9-karat and 18-karat gold and help you choose the perfect metal for every project.
Understanding the Carat: a question of purity
Before comparing, let's go back to basics. The "carat" (abbreviated "k") is a unit of measurement that indicates the purity of gold in an alloy. Pure gold, too soft to be worked in jewelry, is always mixed with other metals (such as copper or silver) to give it its strength and color.
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24k Gold is 99.9% pure gold.
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18k Gold (hallmarked 750) Contains 75% pure gold and 25% other metals.
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9k Gold (hallmarked 375) Contains 37.5% pure gold and 62.5% other metals.
This difference in composition is the key to all the distinctions that will follow.
18k Gold (750/1000): The Standard of High Jewelry
18-karat gold has historically been the benchmark in France for quality jewelry. Its high pure gold content gives it undeniable advantages.
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A rich and intense color: It is the yellowest and most brilliant gold, a noble color that does not tarnish over time.
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A precious asset: With 75% pure gold, it is an excellent investment and a guarantee of quality for your customers.
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Hypoallergenic: Its high gold content minimizes the risk of skin allergies.
For which creations?
18k gold is the preferred choice for high jewelry pieces, timeless jewelry, wedding and engagement rings, and all creations where the preciousness of the metal is a main selling point.
➡️ Ready to create something exceptional? Discover our range of 18-carat gold supplies (chains, clasps, findings...) .
9k Gold (375/1000): The Smart and Resistant Alloy
Newer to the market, 9-carat gold has established itself as a smart and efficient alternative, perfectly suited to new consumer trends.
The advantages of 9k gold:
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Superior resistance: Containing more alloy metals, it is mechanically harder and more resistant to scratches and everyday deformation.
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A more affordable price: Its cost makes it possible to offer genuine gold jewelry to a wider audience or to create larger pieces with a controlled budget.
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The gateway to the jewelry store: It is perfect for trendy collections, "must-have" jewelry, and for customers who want to treat themselves to their first gold jewelry piece.
For which creations?
9k gold is ideal for everyday jewelry, fashion creations, capsule collections, and for reaching a younger clientele. It's the perfect way to democratize fine jewelry.
➡️ Need quality and durability? Explore our 9-carat gold findings and chains.
Summary Table: 9k Gold vs 18k Gold
| Criteria | 9k gold (375/1000) | 18k gold (750/1000) |
| Purity in Gold | 37.5% | 75% |
| Color | A paler, more subtle yellow | Intense and rich yellow |
| Resistance | Very high (more scratch-resistant) | High (more susceptible to scratches) |
| Price | Very accessible | Premium |
| Punch | Clover | Eagle's head |
| Ideal for | Fashion jewelry, accessible collections, everyday pieces | High jewelry, wedding bands, everyday pieces, investment |
Conclusion:The Right Gold for the Right Project
So, 9k or 18k? The best answer is: It depends on your project and your brand positioning.
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Are you aiming for luxury, timeless pieces, and items for inheritance? 18k gold is your signature.
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Do you create trendy, affordable and durable collections for everyday wear? 9k gold is your best strategic ally.
At La Fille du Sud , we make no compromises on the quality of our alloys. Whether you choose the prestigious brilliance of 18-karat gold or the enduring modernity of 9-karat gold, you are guaranteed a supply of top-quality French jewelry to bring your creations to life.
Ready to create?
Browse our entire catalog of Gold Supplies Or Contact our experts for personalized advice on your project.