Numbers represent gold purity through karats (K) like 10K, 14K, 18K, 24K, or millesimal fineness, a three-digit number indicating parts per thousand (e.g., 750 for 18K or 75% gold). The highest purity, 24K, is marked as 999 or 999.9, meaning 99.9% pure gold. Lower numbers like 375 (9K) or 585 (14K) signify more alloy mixed with the gold.
Gold is highly malleable in its purest form, which is why it is mixed with other metals like zinc, nickel and other alloys to increase its durability and strength. 999 is the purest form of gold, meaning it has 99.9% gold whereas 916 has 91.6% gold.
999, for example, is the purist amount, essentially 24 karat gold with a 99.9999% purity. On the other hand, 750 is indicative of a 75% purity level, better known to most as 18 karat gold. The 3-digit stamp sequence generally gets identified as follows: 999.9 or 999 – 24 karat gold.
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535 or 53.5% gold, while most 14k alloys are . 585 or 58.5% gold. Also the stamp of 14K means the same as 14kt. I hope this helps, and reassures you that your earrings are 14K gold. see more.
The number 750 means that the gold is 75% pure and the remaining 25% is made up of other metals. This alloy is slightly purer than 585 gold and therefore usually has a more intense golden color. Due to its higher gold content, 750 gold is generally slightly more expensive than 585 gold.
What does 900 mean on jewelry? The stamp “900” means the piece contains 90% platinum and 10% other metals. Jewelers often used 900 platinum in antique pieces from the early 1900s, especially in Art Deco rings and brooches.
In carats, 333 gold corresponds to 8 carats. However, only 33.3% of a piece of 333 gold jewelry consists of pure gold; the remaining 66.6% consists of other metals, such as copper, silver, zinc or tin.
24ct gold is marked with 999, which indicates a gold content of 999.9 parts per thousand – the purest form of gold that you can get.
Karat System
For instance, 24K gold is pure gold, containing no other metals, but it's soft and not practical for jewelry. More commonly, you might find 18-karat gold, which is 75% gold, known also by the 750 marking. This blend makes the gold more durable while maintaining a rich color.
What Does “Karat” Mean in Gold?
Pure gold is notated as 24K – this is the highest karat level for gold meaning it is 100% pure gold. 18K gold is 75% purity level, 14K is 58.3% purity level, and 10K is 41.7% purity level.
Thrifted from Salvation Army in Canada. Came across something online that “226” could indicate platinum.
Gold is mainly classified by karat (purity) and colour. By karat: Common types are 24K, 22K, 18K, 14K, 10K. By colour: Yellow, White, Rose, Green, etc.
24K Gold (100% Pure Gold)
This softness makes it prone to scratches, dents, and even bending when exposed to everyday activities like cooking, cleaning, or sports. 24K gold is ideal for collectors or special pieces you wear only occasionally, but for daily wear, it's not the most practical choice.
Usage and Symbolism in Jewelry and Gold Items
The '777' mark is often an indication of gold content, effectively representing 77.7% purity. This is slightly below 24-karat, which means the item is an alloy with other metals.
As gold purity increases, so does the price. 14K gold is typically the most budget-friendly option, offering both beauty and strength. 18K gold provides a touch of luxury at a higher price point, while 24K gold, being the purest, is the most expensive per gram.
A 375 Gold stamp visible within an item of jewellery indicates the items is made from 9 carat gold. To explain, the number represents the (37.5%) percentage of gold contained within the item.
The platinum, diamond and sapphire bracelet below would be marked with 950 to denote it's platinum base. 800 – Less common in modern jewelry, this number harks back to a different standard of silver purity, indicating 80% silver content. It's a reminder that standards evolve, much like fashion itself.
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The "325" stamp indicates an alloy where 32.5% of the metal is pure gold, equating to about 8 karats. In contrast, stamps like "750" signify 75% gold, or 18 karats, and "585" means 58.5% gold, or 14 karats. By comparing stamps, you can better understand alloys and the significance of these markings on your jewelry.
On a ring, what 55 means varies. If the ring has a large central stone or is set with multiple gemstones, 55 may mean that the stone or stones have a weight of 55 carats. Alternatively, 55 may mark a foreign ring size. In European standard jewelry sizes, a 55 is between a U.S. 7 and a 7.5.
A “915” stamp means a piece is 91.6% gold or 22k.
The lower the number i.e the 500 stamp means that there is less palladium actually in the pieces of jewellery that is on sale compared to the 950 mark. So really if you were to buy a ring that is marked with 500 you only have 50% of the item made from pure palladium and the other half made from other alloys.