The "code" on a gold bar is primarily its unique serial number, along with markings for the refiner, weight (e.g., 1 oz, 1 kg), and gold purity (e.g., .999 fine or 99.9%), all crucial for authenticity, traceability, and security, often matching details on a certificate and sometimes including modern features like QR codes or holograms (Kinegrams) for verification.
You can find a gold bar's serial number by carefully scanning both sides of the bar. Serial numbers can be found on either the obverse or reverse and should look like a series of digits. Purity markings look a lot like serial numbers, so be sure that you've found the right set of markings.
Dragging your gold over a ceramic plate is another quick and uncomplicated way to test your gold. Simply draw your gold across an unglazed ceramic plate, applying slight pressure. If you can see a gold mark on the ceramic once you've done this, then the gold is real. However if the mark is black then it is fake.
Gold is a chemical element with symbol Au and atomic number 79.
The markings on gold bars are mainly functional and record the name of the manufacturer or issuer where required, the bar's weight and gold purity, and a serial number.
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.
How to identify real gold
Gold is element 79 and its symbol is Au.
If you invested $1,000 in gold 10 years ago (around late 2015/early 2016), your investment would likely be worth significantly more today (late 2025), potentially in the range of $2,000 to over $3,000, reflecting substantial price appreciation, though less than the S&P 500 but outperforming during certain periods of market stress, acting as a hedge against uncertainty, with returns varying based on exact entry/exit points and premiums/spreads.
The float test is a simple way to check if an item is likely real gold. How to Test: Fill a bowl with water and drop the gold piece in. Real gold is dense and will sink to the bottom, while fake gold or gold-plated items may float or hover just below the surface.
Gold is not magnetic. Pure gold (e.g. a bullion bar) is not magnetic. Jewellery is made from a mixture (alloy) of gold and other metals.
Gold is a non-magnetic metal, so if the alloy attracts a magnet, it is definitely fake or mixed with other metals. Check the alloy with a strong magnet to make sure it does not have any magnetic attraction. An acid testing kit can be purchased from specialty markets, and is a popular way to check the purity of gold.
By law, every gold bar, from the smallest to the largest, must OBVIOUSLY be marked and serialized before being placed on the market, for reasons of security, coding and traceability of the same.
Bars are usually stamped with information about the metal content, purity, and the manufacturer's mark, and they come in various sizes and weights. "Bullion" refers to precious metals prized primarily for their metal content rather than artistic or collectible value.
The 3-digit stamp sequence generally gets identified as follows:
There are two other manufacturer markings on a jewel: the purity mark, i.e. a three-digit code which is used to state the purity of the metal (the most common ones are 585 for 14kt gold, 750 for 18kt gold, and 925 for silver); and the maker's mark, which is also used in the U.S., as mentioned above, i.e. a kind of “ ...
417 gold is also known as 10 karat (10K) gold, and it means that the gold is 41.7% pure gold, with the remaining 58.3% made up of other metals. The 417 marking is commonly found on lower-end jewelry pieces.
Authentic gold jewelry should have a stamp to indicate the purity of the gold in the piece. This markcan be in several different formats. For example: 585, 14kt and 14K all mean 14 karat gold. All ofthese formats are easy to understand, except possibly the 3 digit number format.
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.
Magnetic Test
Gold is non-magnetic, so a magnet test can help detect fake gold. Simply bring a strong magnet close to the gold piece. If it sticks, the item likely contains metals other than gold.