The precise quantity of gold is verified through rigorous testing by Valaurum and independent laboratories.


The thin film gold of an Aurum® best displays the beauty and special elemental properties of 24k gold. The individual atoms of an Aurum are spread thinly and accurately to expose as much gold to the surface as possible. Gold coins and bars hide most of the metal under the surface, allowing debasement with tungsten, lead or other materials. Foil and wire can be made in small quantities, but their thickness and purity is highly variable, making them difficult to authenticate.

By contrast, the Aurum’s proprietary security features allow easy verification. These methods include:

Color and Transmission Spectrum We have all seen the luster and rich color of gold. In fact, gold is only ‘gold’ colored when you look at its surface. When gold is thin enough that light can pass through it, it has a unique blue-green color. Most other metals are a shade of dull gray, and no other element has this property. Scientists have known about gold’s unique blue-green color for years, but even expert gold traders are often unaware of this property, since such thin gold is rarely encountered. The human eye is usually effective at recognizing this exact shade of blue, but the color can also be more precisely measured with a spectrometer, which confirms the presence and amount of gold with a quantitative measure of the spectrum of the transmitted light at visible and invisible wavelengths.

Reflection Color and Spectrum Twenty-four karat gold has a distinctive color and lustre. This allows anyone to compare an unknown Aurum side by side with a verified Aurum to see if the reflected lustre and color match. This visual comparison can also be verified with a spectrometer, resulting in a more precise, quantitative measure of the reflected light over the visible and invisible spectrum.

Back Image Each Aurum is made by precisely depositing gold, atom by atom, onto a printed polyester substrate. This produces a unique effect on the reverse side of the Aurum. Where there is no printing, the gold is very shiny, but where gold atoms have fallen on print, the gold has a matte finish, making it look as though the gold itself has been printed in reverse. Simply laminating with gold-colored material will not produce this back image. Only very expensive, specialized deposition equipment will create this effect.

Electrical Resistance Gold has very low electrical resistance, which means electricity can flow through it with relative ease. This is why gold is used for special electronic applications. Thicker amounts of gold allow more free flow of electricity for a given voltage, much as a thicker pipe allows more water to flow for a given pressure. Each issue of Aurum® has a precise electrical resistance that can be measured with various methods.

Oxidation One property of gold is that it resists forming an oxide-also called a tarnish or rust. Unlike other metals, the margins of a gold Aurum will never show any tarnish or other oxidation even if they are exposed to the oxygen in air.

Serial Number Each individual Aurum has a unique serial number. You can contact Valaurum, Inc. through this website to check the serial number and verify that it matches the issue information.

Security Color Shift Thread For certain Aurum issues, a color shift thread running along the back side of the Aurum is used. This thread shows one color when viewed straight on, and a different color when viewed at an angle. This is similar to the color shift materials that have been added to currencies in recent years to deter counterfeiting. This color shift thread has our own unique set of color shift colors which can be compared to a verified Aurum.

Micro-printing Micro-printing at a resolution that cannot be reproduced by common laser printers, scanners, or photocopiers is another anti-counterfeiting technique that is used in stock certificates and currencies. Aurum also has these anti-counterfeiting features, allowing anyone with a magnifying glass to check for micro-printing in detailed parts of the image.