What is 18 Carat Gold? Composition, Hallmarking Law, and Benefits
What is 18 karat gold?
18 karat gold — also referred to as 750 gold — contains 75% pure gold. The remaining 25% consists of other metals such as copper, silver, or palladium, which make the gold harder and more durable. 18 karat gold is considered one of the best combinations of pure gold and alloys: luxurious in appearance, durable enough for jewelry, and high in intrinsic value. Check out our gold-colored necklaces for jewelry with a luxurious gold-colored appearance.
Composition of 18 karat gold
18 out of 24 parts are pure gold; the remaining 6 parts consist of other metals. Copper gives a warmer, rose-red hue — rose gold. Palladium or silver gives a whiter hue — white gold. Zinc increases hardness. Due to its high gold content, 18 karat gold has a richer, more intense color than 14 or 8 karat gold.
History of 18 karat gold
Gold has always held a special place in the history of jewelry. In many cultures — such as in India and Europe — 18 karat gold is used for important occasions like weddings and special gifts. Due to its higher gold content, it is considered a sign of refinement and elegance. Since the 19th century, it has been a popular choice in high-end jewelry due to its combination of purity and durability.
The Dutch Assay Law and 18 karat gold
The sale of gold in the Netherlands is strictly regulated by the Dutch Assay Law. Gold may only be sold as "gold" if it contains at least 14 karats. 18 karat gold amply meets this standard with 75% gold content. 18 karat gold jewelry is stamped with "750" — the percentage of pure gold in the alloy. This hallmark guarantees authenticity and protects consumers against deception.
18 karat gold versus other karat types
8 karat (333) — 33.3% pure gold. Hard and affordable, not recognized as gold in the Netherlands. 14 karat (585) — 58.5% pure gold. The Dutch standard: more durable than 18 karat, slightly less luxurious. 18 karat (750) — 75% pure gold. Richer color, higher value, slightly softer. 24 karat — 99.9% pure gold. Very valuable but too soft for daily wear. Combine with matching 925 silver jewelry for a complete jewelry collection.
Frequently asked questions about 18 karat gold
- Is 18 karat gold real gold?
- Yes, 18 karat gold is real gold and contains 75% pure gold. It is legally recognized as gold in the Netherlands under the Assay Law. The 750 hallmark guarantees authenticity.
- Can 18 karat gold discolor?
- 18 karat gold can slightly discolor over time with extensive exposure to moisture, air, and chemicals. Due to its high gold content, it oxidizes less quickly than lower karat types. Regular cleaning with a soft cloth and mild soap maintains its shine.
- Is 18 karat gold suitable for daily wear?
- 18 karat gold is durable enough for engagement rings and necklaces, but softer than 14 karat gold. For intensive daily use — such as wedding rings — 14 karat is a more robust choice.
- How do I care for 18 karat gold jewelry?
- Clean regularly with a soft cloth and mild soap. Avoid contact with perfume, chlorine, and harsh chemicals. Store in a dry place in a jewelry box when not worn.
- What is the difference between 18 karat and 14 karat gold?
- 18 karat contains 75% pure gold and has a richer color and higher intrinsic value. 14 karat contains 58.5% pure gold and is harder and more durable for intensive daily wear. Read more on our 14 karat gold encyclopedia page.