When it comes to buying gold jewellery, not all that glitters is equal. Gold purity, the proportion of actual gold in a piece, directly affects its colour, durability, price, and suitability for different occasions. Whether you are shopping for a wedding band, a Si Dian Jin set, or a piece of everyday jewellery, understanding how the gold karat system works will help you make a more informed and confident choice. Here is everything you need to know.
Key Takeaways
- Gold purity is measured in karats (K), with 24K representing the purest form of gold at 99.9%.
- Higher karat gold is more valuable but softer; lower karat gold is more durable for daily wear.
- In Singapore, 22K (916) gold is a popular choice for wedding jewellery, while 18K gold is widely preferred for everyday pieces.
- Gold price is influenced by karat purity, current market rates, craftsmanship, and certification.
- Poh Heng uses the karat system for all our gold jewellery to provide customers with clear, trustworthy purity standards.
What is Gold Purity?
Gold purity refers to the proportion of pure gold in a piece of jewellery, expressed using the karat system. The karat scale divides gold purity into 24 equal parts, so a piece described as 24K gold is considered pure gold, while an 18K piece contains 18 parts gold and 6 parts other metals.
Because pure gold is naturally very soft, it is almost always alloyed with other metals such as silver, copper, and zinc to improve its strength and make it practical for jewellery-making. The higher the karat, the more gold is present and the purer, richer, and more valuable the piece.
The Karat System: 18K, 22K, and 24K Compared
18K Gold: The Everyday Wearable
18K gold contains 18 parts pure gold out of 24, giving it a gold content of 75%. The remaining 25% consists of metal alloys, which give 18K gold its greater hardness and scratch resistance compared to higher-karat gold. This makes it an excellent choice for jewellery intended for daily wear, including engagement rings and diamond-set pieces, where durability matters.
18K gold is also the most versatile karat when it comes to colour variation, the alloy composition can be adjusted to produce yellow gold, white gold, and rose gold finishes. Explore our 18K gold jewellery collection, including the diamond pieces in our Poh Heng Trust® Diamonds range, which are crafted predominantly in 18K gold.
22K Gold: The Singapore Favourite
22K gold, also commonly referred to as 916 gold in Singapore, reflecting its 91.67% gold content, is one of the most popular choices for gold jewellery in this region. With 22 out of 24 parts being pure gold, it offers a rich, warm golden lustre that is distinctly more vibrant than 18K gold, while retaining enough alloy content to be shaped into well-crafted, wearable pieces.
In Singapore and across much of Southeast Asia, 22K gold holds deep cultural significance. It is widely used for wedding bands, traditional gifts, and festive jewellery, prized for its combination of high purity and relative durability. Our 22K gold jewellery collection, including the signature Poh Heng ORO22® collection, is crafted in 22K / 916.67 gold and designed to be worn for life's most meaningful occasions.
24K Gold — The Purest Form
24K gold, also known as 999 gold (reflecting a purity of 99.9%), is the highest and purest grade of gold available. Its deep, unmistakable yellow is the colour of gold in its most natural state, and it is the benchmark against which all other karat grades are measured.
Because of its exceptional softness, 24K gold is generally not used for intricate, stone-set jewellery, it is most suited to simpler forms such as bangles, chains, and gold bars, where the design allows for the metal's natural properties. It is also the preferred choice for investment pieces, as its value is most directly tied to the gold spot price. Browse our 24K gold jewellery and our Poh Heng Legacy® collection, which showcases fine 24K craftsmanship.
Gold Colours: How Alloys Create Different Tones
The colour of your gold jewellery is determined by the types of metals used in the alloy blend:
-
Yellow gold retains the natural warm tone of gold, with silver and copper added to strengthen it. It is the most traditional colour and closest to the natural appearance of the metal.
-
White gold is created by alloying gold with white metals such as palladium or silver, and is typically finished with a rhodium plating to enhance its bright, silvery sheen.
-
Rose gold gets its distinctive blush tone from a higher proportion of copper in the alloy mix. It has become particularly popular for engagement rings and couple bands in recent years.
It is worth noting that colour choice does not affect the karat, an 18K yellow gold ring and an 18K rose gold ring have the same gold purity; only the alloy composition differs.
Gold Purity and Pricing
Gold jewellery pricing is influenced by several factors working together:
Market gold rate: The base price of gold fluctuates daily according to global commodity markets. At Poh Heng, our prices at checkout reflect the prevailing gold rate for the day.
Karat purity: The higher the karat, the greater the gold content, and the higher the raw material cost. 24K gold will always carry a premium over 22K, which in turn is priced above 18K, for the same weight.
Craftsmanship and design: Intricate workmanship, stone settings, and detailed finishing all contribute to the overall price of a piece beyond the material cost alone.
Certification: Certified gold jewellery, where purity has been independently verified, may carry a slight premium but provides meaningful assurance of quality and value.
Gold Purity for Weddings and Special Occasions
In Singapore, gold jewellery plays a central role in many wedding and cultural traditions. High-karat gold, particularly 22K, is traditionally favoured for couple wedding bands and bridal gifts, as it is seen as a symbol of wealth, purity, and good fortune.
For the Si Dian Jin, the four gold gifts presented by the groom's family to the bride in traditional Chinese wedding customs, high-purity gold is especially meaningful. Our Si Dian Jin collection is crafted in 22K gold and designed to honour this cherished tradition with both beauty and cultural authenticity. To learn more, you may also read our guide on everything you need to know about Si Dian Jin.
Caring for Your Gold Jewellery
Regardless of karat, a few simple habits will keep your gold jewellery looking its best:
- Remove rings and bracelets before activities involving chemicals, such as swimming in chlorinated pools or using cleaning products.
- Store pieces separately, ideally in individual pouches or a lined jewellery box, to prevent scratching.
- Clean gold jewellery gently with a soft cloth or a mild soap solution, then dry thoroughly.
Visit Poh Heng's Jewellery Services for professional cleaning and maintenance to restore your pieces to their original lustre.
Closing Thoughts
Understanding gold purity is the foundation of making a confident, informed jewellery purchase. Whether you are drawn to the durability and design flexibility of 18K gold, the rich cultural warmth of 22K / 916 gold, or the unmatched purity of 24K / 999 gold, each karat has its own distinct character and ideal applications.
At Poh Heng, our full range of gold jewellery collections spans all three karat types, with pieces designed for everyday wear, bridal occasions, and meaningful gifts. Visit any of our island-wide boutiques, where our team is always on hand to help you find the perfect piece, and explain exactly what you are getting.
Frequently Asked Questions
What does "karat" mean in gold jewellery?
Karat (K) is the unit used to measure gold purity. It divides gold content into 24 parts, so 24K gold is pure gold, 22K contains 22 parts gold out of 24 (91.67% purity), and 18K contains 18 parts gold out of 24 (75% purity).
What is the difference between 916 gold and 999 gold?
These are alternative purity notations commonly used in Singapore. 916 gold refers to 22K gold, with a gold content of 91.6%. 999 gold refers to 24K gold, with a purity of 99.9%, the highest available. Both notations indicate the same purity as their karat equivalents.
Which gold karat is best for everyday jewellery?
18K gold is generally the most practical choice for daily wear. Its higher alloy content makes it harder and more resistant to scratches and dents compared to 22K or 24K gold, while still carrying a meaningful gold content of 75%.
Is 24K gold too soft to wear daily?
Yes, for most jewellery styles. 24K gold is very malleable and can deform with regular wear. It is best suited for simpler pieces such as bangles, chains, and gold bars, or for investment purposes, rather than for rings or stone-set pieces that need structural strength.
Why is 22K gold so popular in Singapore?
22K (916) gold occupies a sweet spot between high purity and practical wearability. It carries deep cultural significance in Singapore and across Southeast Asia, particularly for wedding jewellery and traditional gifts like Si Dian Jin, and its rich golden colour is distinctly more vibrant than 18K gold.
How is gold jewellery priced at Poh Heng?
Our prices are based on the prevailing daily gold rate for the respective karat (22K or 24K), combined with the craftsmanship and design of the piece. The current gold rate is displayed at the top of our website and is updated regularly to reflect market movements.
How can I verify the purity of my gold jewellery?
Look for the karat stamp on your piece, for example, "750" for 18K gold, "916" for 22K, or "999" for 24K. At Poh Heng, all our gold jewellery is produced to verified purity standards, and our team is happy to explain the certification and quality assurance behind any piece in our collections