Wonder what your gold is worth? The ultimate first step is to understand its purity. This is a necessary step that determines the actual value of an item, be it bullion or a fine piece of jewelry, or even a plain 10-gram piece of gold coin.
Luckily, the hallmark of purity of most reputable gold items will be hallmarked or marked in some conspicuous manner. But what do these numbers and abbreviations represent?
In the following, we will discuss the various methods typically used to indicate the purity of gold, starting with the old karat system up to the contemporary millesimal fineness.
Surely you can understand what you are selling or buying.
What is 999 Gold? Decoding the “Fine” in Fine Gold
You look at the number 999 on a bar or a coin of fine gold, and what is that number? In other words, 999 gold is the purest and purest gold that you can literally purchase, which officially is known as 24 Karat (24K) gold. Millesimal fineness 999 fine gold means that the object includes 999 parts of pure gold in 1000 total parts or 99.9 percent pure gold. This is as near perfection to normal investment-grade gold as can be!
Key Highlights of 999 Gold:
Purity: 99.9%
Common Forms: Gold bars and bullion
Benefits: Very pure, internationally known, perfect to invest in.
Drawbacks: Soft and not as durable and so they cannot be worn on regular jewelry.
What is 9999 Fine Gold? The Pinnacle of Purity
Assuming that 24K is made of 999 fine gold, then what is so special about 9999 fine gold (sometimes called four nines fine)?
In simple words, the difference reduces to the refinement process. Although they are both regarded as extremely pure gold, 9999 is a level of processing that attains an even greater purity.
The Numerical Advantage
In the millesimal system, the numbers tell the whole story:
- 999 fine gold = 99.9% pure.
- 9999 fine gold = 99.99% pure.
The additional nine implies that out of every 10,000 parts, there will be just one part that will be regarded as an impurity. It is an unbelievably finer calculation that denotes polished gold.
Key Highlights of
999.9 Gold:
Purity: 99.99%
Common Forms: Premium gold bars and select digital gold products
Advantages: Highest quality, prestigious appeal, excellent for long-term wealth preservation
Limitations: Softer than 999 gold and comes with a higher price premium
999 vs 999.9 Gold: Does That Extra Decimal Really Matter?
We’ve established that both 999 gold vs 999.9 gold are considered 24 Karat, the purest you can realistically purchase. So, why do dealers make a distinction?

The Subtle difference between 999 and 999.9 gold
| Feature | 999 Gold (99.9%) | 999.9 Gold (99.99%) |
| Purity Level | 99.90% | 99.99% |
| Common Use | Standard investment-grade coins & bars (e.g., Chinese Pandas) | High-premium investment bullion (e.g., Canadian Maple Leafs) |
| Price Point | Slightly lower | Slightly higher due to the cost of extra refining |
| Durability | Soft (as is typical for 24K) | Very soft (even more prone to scratching) |
| Prestige Value | High | Highest (often called ‘Four Nines Fine’) |
What is the Minimum Gold Purity?
Every country sets a legal threshold for the minimum gold purity required for an item to be marketed and sold as gold. These standards vary quite a bit:

| Gold Purity (Approx.) | Millesimal Fineness | Karat (ct) | Common Examples / Notes |
| 99.90% | 999 | 24ct | Purest standard investment gold. |
| 99.50% | 995 | 24ct | Investment grade (sometimes seen in older bars). |
| 95.83% | 958.3 | 23ct | High-purity jewelry (common in certain Asian countries). |
| 91.60% | 916 | 22ct | Traditional Indian/Asian jewelry, high-grade coins. |
| 75% | 750 | 18ct | High-end, durable jewelry. |
| 58.50% | 585 | 14ct | Durable, popular wedding rings in the US/Europe. |
| 41.70% | 417 | 10ct | US legal minimum, very durable jewelry. |
| 37.50% | 375 | 9ct | UK/European legal minimum. |
Reference link: Common Gold Purity Levels at a Glance
Which Gold Purity is Right for Your Investment?
Once the differences have been reviewed, it all depends on your own investment plan and budget. Does this mean that you are only concerned with the cost per gram, or do you expect the utmost prestige and purity?
The following is a simple guideline to assist you in deciding as to which fine gold best fits your portfolio:
For Affordability & Liquidity: Go with 999 Gold
The best and convenient option of most investors is 999 gold. Since it is slightly less expensive to refine, it tends to be a lower premium than the spot price. This renders it very convenient and very liquid, and thus it can be sold and purchased easily when the need arises. It is an acceptable investment in gold.
For Prestige & Maximum Purity: Choose 999.9 Gold
When you are aiming to possess the most pure gold commercially available, or you are interested in gathering the best bullion that is produced by the world renown mints, then 999.9 gold is the best. The first cost can be a bit more expensive but some long-term holders of wealth enjoy the fact that they are the owners of the most exquisitely perfected product.
Conclusion
When you next buy gold, then, keep this in mind: It is never just a purchase. Gold is an embodiment of permanence, of beauty and an actual guarantee of the timeless value, which is yet to be made even brighter by the generations yet to come. That confidence? That’s priceless.
Ready to invest in gold? Explore NB Bullion’s Digital Gold platform for a safe, simple, and reliable investment experience.
FAQs
Is 999 digital gold backed by real physical gold?
Absolutely, yes. When you invest in 999 digital gold, you are purchasing a fractional ownership of physical, investment-grade gold that is 99.9% pure. This gold is professionally and securely stored on your behalf in insured, bank-grade vaults by the platform’s custodian. Your digital holdings represent tangible pure gold that truly exists.
Is 999.9 digital gold a better investment than 999 gold?
To the greatest majority of investors, the difference is not so big. But 999.9 digital gold does contain a little more purity of 99.99%. That is why it is a premium one and is in demand among investors who want to achieve the highest possible level of purity. In case you are in the highest refinement possible, 999.9 is the one to go.
Can I convert my digital gold into jewelry?
Yes, you can physically redeem your amassed gold on the majority of the reputable web-based gold systems. But, as the amount of gold you hold (999 or 999.9 fine gold) is 24 Karat and is of a very soft nature, it is usually supplied in the form of coins or small bars. In order to make it into wearable jewelry, it has to be mixed with other metal types (such as 24K to 22K), and this implies that you might have to pay the extra making fees during the redemption process.
How do I ensure the purity of my digital gold investment?
The trick is to select the provider carefully. Invest only on reputable sites that deal with refiners who are of international standards (such as LBMA-accredited refiners). Always ensure that your invoice on the purchase contains a clear mention of the millesimal fineness (999 or 999.9) and offer a hallmark certification guarantee. It is this openness that you can be sure of pure gold.