Buying physical gold as a store of value only makes sense if what you receive is exactly what you think you are buying: metal of the stated purity, produced by a recognised refiner and backed by a documentary chain that ties it to you. Certification is not decorative packaging: it is what turns a bar or a coin into a verifiable, liquid asset. This article explains, without unnecessary jargon, how investment gold is certified and what a retail investor should check before paying.
1. Why certification matters
Gold is one of the few assets you can physically hold in your hand and, precisely for that reason, one of the most exposed to counterfeiting and to items of dubious origin. An uncertified bar is not necessarily fake, but it forces you to prove its purity and origin every time you want to sell it, and that friction translates into a discount, into assays and into wasted time.
Certification serves three functions the investor should not separate: it attests to the purity of the metal, it identifies the refiner that produced it and it documents the traceability of the piece. When all three are present and consistent with one another, the gold sells in any wholesale market with no discount for doubts over authenticity. When one is missing, the asset loses liquidity.
2. Purity: 999.9 and what "24 carats" means
The purity of investment gold is expressed in thousandths. The reference standard for investment bars is 999.9, that is, 999.9 parts of pure gold per 1,000: what is colloquially called "four-nines gold". It is equivalent to 24 carats on the traditional scale, where 24 carats represent pure gold and lower figures indicate alloys (18 carats are 750 thousandths, 22 carats around 916).
Purity by product
Not all investment gold has the same fineness, and it is not always a defect. Many historical coins were minted at 22 carats to gain hardness and withstand the wear of circulation; their investment value is still that of the fine gold they contain, not that of the alloy. What matters is knowing the real fineness and the fine-gold content of each piece.
| Type of product | Usual purity | Typical documentation |
|---|---|---|
| Investment bar | 999.9 (24 carats) | Refiner hallmark, serial number and assay card. |
| Modern bullion coin | 999 to 999.9 | Struck by an official mint; weight and fineness guaranteed by issue. |
| Historical investment coin | 900 to 916 (21.6-22 carats) | Fineness and fine-gold content known and standardised by type. |
The figure that must never be missing is the fine-gold content: the grams or ounces of pure gold the piece actually contains. That is what determines its value against the market price.
3. The LBMA "Good Delivery" hallmark and accredited refiners
The most relevant standard in the wholesale market is the LBMA "Good Delivery" standard (London Bullion Market Association). It is not a commercial brand, but a list of refiners that meet strict requirements of minimum purity, production consistency and controls on the origin of the metal. A bar produced by a refiner accredited on that list enjoys almost universal acceptance in the professional circuit.
For the retail investor, the benefit is direct: a bar from an accredited refiner is resold without the need to re-assay the metal. The refiner's reputation, verifiable on the public list, replaces mistrust. That is why it is advisable to prioritise product from accredited refiners over anonymous bars or unverifiable brands, even when the latter appear slightly cheaper.
A small saving on the purchase price of a bar without recognised traceability usually turns into a bigger discount at the moment of sale. Certification is paid for once; the lack of certification is paid for every time.
Standards on the origin of the metal
Modern accreditation is not limited to purity: it also incorporates criteria on the responsible sourcing of gold, aimed at avoiding metal of illicit origin. For the buyer, this reinforces that the asset will not carry legitimacy problems in the future.
4. The certificate and the assay card
Investment bars are usually delivered in a sealed blister that incorporates an assay card. That card certifies, tied to the piece, three data points: the weight, the purity and a unique serial number also engraved on the bar itself. The seal of the blister is part of the guarantee: opening or tampering with it may require a re-assay before resale.
What must match
- The serial number engraved on the bar and the one printed on the assay card must be identical.
- The weight and fineness stated on the card must correspond to those engraved on the piece.
- The refiner's name must appear both on the bar and in the documentation.
In modern bullion coins the role of the "certificate" is played by the official minting itself: the mint guarantees weight and fineness at the moment of issue, and the standardised design makes counterfeiting harder. In these cases, rather than a paper certificate, the backing is the recognised issue.
5. Traceability and buying "in your name"
The technical certification of the piece is only half the problem. The other half is that the gold is tied to you unequivocally. Here it is worth distinguishing between holding certified gold and holding gold in your name.
Allocated versus unallocated gold
The market speaks of allocated gold when the metal is identified as yours —specific pieces, with their serial numbers, reserved to your ownership— and of unallocated gold when you only hold a claim against a counterparty that is, in practice, a credit. The physical investment gold you buy and store with full traceability is allocated gold: you do not depend on the solvency of a bank or a counterparty to recover it.
Buying "in your name" means keeping the purchase documentation (an invoice identifying the pieces and their serial numbers) that proves you are the owner. That chain —invoice, serial number, refiner's certificate— is what allows you to prove ownership and the lawful origin of the metal in any future sale or before the tax authorities.
For the practical framework of buying in Spain, with VAT, ways of acquiring and common mistakes, see our guide to buying physical gold in Spain without making mistakes.
6. How to spot dubious gold and retail investor mistakes
Most problems do not come from sophisticated counterfeits, but from purchases made without checking the basics. These are the most common mistakes:
Mistake 1: Buying without a certificate or assay card
A loose bar, with no sealed blister or assay card, is not useless, but it passes on to the resale the cost and delay of proving its purity. Unless the price clearly offsets that friction, it is not the choice of the wealth-minded investor.
Mistake 2: Ignoring the refiner
A bar of an unknown or unverifiable brand sells worse. Before buying, it is worth confirming that the refiner is identifiable and recognised in the market.
Mistake 3: Tampering with the seal
Opening the blister to "get a better look" at the piece breaks part of the guarantee and may require a re-assay. The seal is kept intact until the moment of sale.
Mistake 4: Not keeping the purchase documentation
The invoice identifying the pieces by their serial number is the proof of ownership and of lawful origin. Losing it complicates resale and tax justification.
Mistake 5: Mistaking a low price for a good purchase
A price noticeably below the market almost always hides a problem: purity lower than stated, absence of traceability or pieces of dubious origin. In investment gold, an abnormally cheap price is a warning sign, not an opportunity.
7. How Equus Capital operates
At Equus Capital we work exclusively with certified investment gold: metal from accredited refiners, with documented purity, serial number and assay card, or coins of recognised official minting. Each transaction is formalised with an invoice that identifies the pieces by their serial number, so that the metal is tied to its owner with full traceability. We also offer secure custody for those who prefer not to take on storage, always on the basis of allocated gold, with no exposure to the solvency of a counterparty. The purpose is simple: that the gold you buy is genuine, is in your name and can be sold again without friction.