What Is an Assay Card on a Gold Bar?

A small laminated card sealed inside a bar’s packaging does something important: it tells every future buyer exactly what the bar is, who made it, and what it weighed on the day it left the refinery. That card is called an assay card, and it is the primary authentication document for investment-grade gold bars sold into the IRA and wholesale precious metals markets.

For retirement investors, the assay card matters at two distinct moments: when the custodian accepts the bar for the account, and again when the bar is eventually sold or distributed. Understanding what the card certifies, who issues it, and why the sealed packaging must stay intact can prevent costly surprises at both points.

What an Assay Card Certifies

Assay is the process of chemically testing metal to determine its composition. An assay card is the written record of that test, attached to the specific bar it describes. Depending on the refiner, the card may take the form of a printed laminate sealed inside a blister pack, a certificate enclosed in a branded envelope, or a holographic label bonded directly to the bar’s face. The format varies; the core information does not.

A standard assay card on a gold bar records at minimum:

• Purity (fineness): expressed as a decimal. A bar reading .9999 is 99.99% gold, sometimes called four nines fine. A bar reading .9950 is 99.50% gold, which is the minimum required for COMEX futures delivery and IRS IRA eligibility.
• Weight: typically in troy ounces or grams. One troy ounce equals 31.1035 grams. The card states the bar’s exact weight to multiple decimal places.
• Serial number: a unique identifier linking this specific bar to the refinery’s production records. A matching serial number stamped on the bar confirms the card belongs to that bar.
• Refiner name and hallmark: the name, logo, and often the accreditation number of the producing refinery.
• Date of assay: the date the bar was tested and certified, which establishes its place in the production chain.

Some refiners add the assayer’s name, a QR code linking to an online verification page, and the bar’s country of origin. Premium sealed formats from refiners such as PAMP Suisse use a serialized CertiPAMP holographic system that allows buyers to verify each bar’s serial number against an online database before purchase. This kind of digital verification layer is an extension of the same function the physical assay card serves.

Who Issues Assay Cards

Not every company that produces gold bars is qualified to issue an assay card that the wholesale market accepts at face value. Two benchmarks define recognized assay authority in the gold market: accreditation by the London Bullion Market Association and approval by COMEX.

The LBMA Good Delivery List

The London Bullion Market Association publishes a public list of accredited gold and silver refiners whose bars are accepted for delivery in international over-the-counter market transactions. To achieve Good Delivery status, a refiner must submit bars to an independent probing program that tests purity, weight, and physical dimensions against LBMA specifications. The minimum fineness for a gold Good Delivery bar is 0.995 (99.5%). The full rules are available at lbma.org.uk.

Good Delivery status requires periodic re-approval. A refiner removed from the list loses the right to label its new bars Good Delivery. Bars produced while the refiner was on the list retain their certification, which is part of why chain-of-custody documentation matters so much: the assay card is dated evidence of when and by whom the bar was certified.

COMEX-Approved Refiners

COMEX, the primary precious metals futures exchange in the United States and now part of CME Group, maintains an approved brand list for gold bars that may be delivered in settlement of a futures contract. Fineness requirements for COMEX gold delivery align with LBMA standards at 0.995 or better. The COMEX and LBMA standards are not identical in every detail, but their fineness minimums for gold converge. This alignment is directly relevant to IRA eligibility, as explained in the IRS fineness section below.

Common Refiners and Their Certification Formats

The table below shows major refiners whose bars are widely accepted in the IRA and institutional markets, along with the certification format each typically uses:

Each refiner uses its own terminology (“assay card,” “certificate of authenticity,” “assay certificate”), but the underlying function is identical: the document ties the bar’s physical characteristics to a recorded production event at a certified facility.

In Assay vs. Out of Assay

The precious metals market distinguishes between two bar states: “in assay” and “out of assay.” This distinction affects how buyers, dealers, and depositories price and accept bars.

In assay means the bar remains in its original, unopened tamper-evident packaging with the assay card intact. The chain of custody is unbroken from the refinery forward. Dealers, depositories, and institutional buyers accept in-assay bars at full market-based pricing without requiring additional testing.

Out of assay means the original packaging has been opened, damaged, or the assay card has been separated from the bar. This does not automatically mean the bar is fraudulent or substandard, but it does mean the direct certification chain from the refiner is interrupted. A buyer who receives an out-of-assay bar cannot confirm through the packaging alone that the bar has not been altered since leaving the refinery.

The practical consequence is that out-of-assay bars typically trade at a discount to in-assay bars of the same stated purity and weight, because the buyer must factor in the cost and time required to re-assay the bar before it can re-enter the standard trading chain. Re-assaying involves shipping the bar to an independent precious metals testing laboratory, which charges a fee and takes time to return results.

For investors holding gold outside an IRA for personal possession, this distinction is a strong reason to store bars in their original sealed packaging and avoid opening them. For IRA investors, the issue is managed by the depository, which stores all bars sealed.

Why the Sealed Package Matters at Buyback

When a gold IRA investor liquidates their account or takes an in-kind distribution, the bars held by the depository re-enter the market. Buyers at that point, whether a dealer, another investor, or a refinery, will evaluate each bar’s condition and documentation.

A bar that comes out of the depository in its original sealed assay packaging commands the highest resale price. The receiving dealer can log the serial number, confirm the sealed state, and pass the bar along without incurring re-assay costs. This is the standard condition in which bars circulate through the wholesale precious metals chain.

A bar delivered out of assay forces the receiving dealer to choose between accepting a reduced price that reflects the verification cost, conducting a new assay before resale, or referring the seller to a refinery willing to melt and recast the bar. Any of those paths costs time and money that reduces the net proceeds the investor receives.

Depositories that store IRA precious metals maintain bars in sealed condition precisely to protect account holders’ future resale value. They track each bar by serial number and store the bar with its assay card. At distribution, bar and documentation ship together. This is one practical reason the IRS structure places physical custody with the depository rather than the investor: it preserves the chain of custody that supports full market value at the end of the account’s life.

How Assay Verification Works Inside a Gold IRA

IRA investors often wonder what happens to their gold after they purchase it. The answer is that the custodian and the depository handle all physical verification. The investor never needs to personally inspect or open assay packaging.

The Custodian’s Role

Under Internal Revenue Code Section 408(a), IRA assets must be held by a bank, federally insured credit union, or an IRS-approved non-bank trustee. For precious metals IRAs, the custodian is typically an IRS-approved non-bank trustee whose core function is to hold legal title to IRA assets on behalf of the account holder. When a gold purchase is made, the custodian instructs the dealer to ship the bars directly to an approved depository. The bars never pass through the investor’s hands.

The Depository’s Intake Process

An approved precious metals depository receives bars from the dealer, verifies each bar against its assay documentation, logs the serial number into its inventory system, and stores the bar in a vault. The intake verification typically confirms:

• The bar’s serial number matches the assay card
• The tamper-evident seal is intact
• The stated purity meets the IRS fineness requirement
• The weight matches the assay card’s stated weight

This verification is performed by depository staff. The account holder receives a holdings statement that lists the serial numbers and specifications of their bars, confirming what the depository holds on their behalf. There is no need for the investor to visually inspect the bar itself.

At Distribution

When an account holder takes a distribution, two paths are available. A cash distribution involves the depository selling the bars at current market prices and transmitting the proceeds to the account holder or to a rollover account. An in-kind distribution involves the depository physically shipping the bars to the account holder or another approved location.

For in-kind distributions, depositories typically ship bars in their original sealed packaging with the assay card intact, preserving the chain of custody for any future sale. The tax treatment of distributions from a precious metals IRA is specific to each account holder’s situation, account type, and age. Consult your tax advisor for guidance before requesting a distribution of any kind.

IRS Fineness Requirements and the Assay Card

Internal Revenue Code Section 408(m)(3) sets the minimum purity standard for precious metals held in an IRA. The statute specifies two categories of eligible metals:

The first category covers certain specific U.S. Mint coins, including American Gold Eagle coins. These coins are explicitly included in the statute by reference to their coinage code, which means they qualify for IRA holding regardless of their gold fineness. American Gold Eagles are minted in 22-karat gold (0.9167 fine), with copper and silver added for durability. Congress included them by name in the statute; the general bullion fineness threshold does not apply to them.

The second category covers bullion (bars and rounds) from any refiner, provided the metal’s fineness equals or exceeds the minimum that a regulated contract market such as COMEX requires for delivery in satisfaction of a futures contract. For gold, that minimum is 0.9950 fine (99.5%). Silver, platinum, and palladium have their own minima under the same framework.

The assay card is the primary document establishing that a bar meets the 0.9950 fineness threshold. When a custodian or dealer evaluates a bar for IRA eligibility, the stated fineness on the assay card is the first reference point. A bar from an LBMA Good Delivery refiner carrying an assay card showing 0.9999 fine gold satisfies the IRS requirement with margin. A bar with no documentation, or with documentation that cannot be traced to a recognized refiner, requires additional verification before a custodian will accept it.

For more detail on how to independently verify a bar’s purity, see our guide on how to verify gold purity. For a broader look at authenticating physical gold, see is your gold real?

Assay Cards vs. Certificates of Authenticity

The terms “assay card” and “certificate of authenticity” are used interchangeably by many dealers and refiners. The distinction between them is worth understanding, even though it does not affect IRA eligibility in most cases.

An assay card specifically documents that the metal was chemically tested (assayed) to determine its actual composition. The card is issued by the refiner based on direct testing of that production batch or, in higher-precision formats, that specific serialized bar. The assay is the measurement; the card is the record of it.

A certificate of authenticity is a broader term that may or may not imply direct chemical testing of the specific bar it accompanies. Some certificates are issued based on the refiner’s production process quality control rather than on a bar-by-bar assay. In practice, bars from LBMA Good Delivery accredited refiners carry both the specific assay documentation and the backing of the LBMA’s independent oversight program, making the distinction less material for standard investment-grade bars.

For IRA purposes, the critical factor is the refiner’s accreditation status and the bar’s stated fineness, not the exact label on the documentation. A bar from a recognized LBMA Good Delivery or COMEX-approved refiner that carries any form of sealed certification showing 0.9950 or higher fineness satisfies the IRS requirement. Consult your custodian if you are evaluating bars with non-standard documentation before making a purchase for your IRA.