1 Troy Ounce Iridium Bar

The Rarest Precious Metal on Earth

Own What Few Can

Iridium is the rarest naturally occurring precious metal on Earth. Geological research places it among the least abundant metallic elements in Earth's continental crust, with concentrations so extraordinarily low that it is measured in mere parts per billion. [1, 2]

The U.S. Geological Survey identifies the platinum-group metals among the rarest metallic elements in Earth's upper continental crust. Iridium occupies the extreme low-abundance range of these geological measurements. [1]

Produced almost entirely as a byproduct of platinum-group mining and associated refining operations, Iridium enters the global market in exceptionally limited quantities. Johnson Matthey's 2026 market estimates place annual worldwide Iridium supply at approximately 229,000 troy ounces. [3]

Each bar contains over one troy ounce of solid 99.99% pure Iridium, offering a rare opportunity to own a precious metal that very few investors or collectors have ever physically held.

Exceptional Scarcity

Iridium is distinguished by characteristics that set it apart from traditional precious metals:

Among the rarest precious metals in Earth's continental crust, according to geological abundance research. [1, 2]

Annual global supply of approximately 229,000 troy ounces, based on 2026 industry estimates. [3]

Produced primarily as a byproduct of platinum-group mining and refining rather than from dedicated Iridium mines. [4]

An exceptionally small and specialized physical bullion market compared with Gold, Silver and Platinum.

Industrial applications that compete for limited quantities of newly refined metal. [3, 5]

Its rarity is not created by marketing. It is defined by geology and the extraordinary constraints of its production.

A Metal Built to Last

Iridium possesses extraordinary physical properties that distinguish it from nearly every other metallic element.

Among the densest naturally occurring elements, with a theoretical density of approximately 22.56 g/cm³. [2]

Exceptional corrosion resistance, recognized as among the highest of all metals. [2]

Extremely high melting point of approximately 2,446°C (4,435°F). [2]

Naturally silvery-white metallic appearance and remarkable durability under extreme conditions. [2]

These characteristics make Iridium valuable in specialized applications involving aerospace engineering, advanced electronics, high-temperature crystal growth, scientific instrumentation, chemical processing and industrial electrodes. [2, 5]

Aerospace and Space Exploration

Iridium's extraordinary heat resistance, chemical stability and durability make it especially valuable for specialized aerospace and space-exploration applications.

NASA uses Iridium protective cladding in radioisotope power systems, where it helps contain radioactive fuel used to provide electricity for spacecraft and planetary exploration missions. These systems have supported missions operating far from the Sun, where conventional solar power can be impractical. [5]

Iridium-based materials are also studied and used in specialized high-temperature and extreme-environment aerospace components, where reliable performance is essential.

Few precious metals combine Iridium's extreme scarcity with such demanding technological applications.

A Unique Addition to a Precious Metals Portfolio

Gold has long served as a foundation of precious-metal ownership. Iridium offers something fundamentally different: exposure to one of the smallest and most specialized physical precious-metal markets in the world.

For collectors and long-term precious-metal owners, Iridium offers:

Ownership of an exceptionally scarce physical element.

Diversification beyond traditional bullion metals.

Exposure to a metal with geographically concentrated and highly constrained primary production.

A tangible asset rarely encountered in conventional bullion investment products.

Unlike Gold and Silver, Iridium does not have a comparably established retail bullion market. Its limited liquidity, specialized market structure and potentially substantial buying and selling spreads should be considered when purchasing it for investment purposes.

Whether acquired as a scientific collectible, a long-term tangible holding or an addition to a diversified precious-metals collection, Iridium stands apart from conventional bullion.

Authenticity You Can Verify

Each Stack Platinum® Iridium bar is supplied with documentation supporting its stated purity and composition.

Every bar includes:

Certificate of Analysis (COA).

Spectrographic analysis report.

Documented 99.99% Iridium purity.

Secure protective packaging.

These documents provide product-specific analytical information to help buyers evaluate authenticity and purity.

Specifications

Metal: Iridium (Ir), Platinum Group Metal

Weight: Over 1 Troy Ounce

Purity: 99.99% Iridium

Dimensions: Approximately 30 mm × 30 mm × 2 mm

Manufacturing Method: Pressed-and-sintered Iridium sponge

Estimated Bulk Porosity: Approximately 25%

Documentation: Certificate of Analysis and spectrographic purity report included

Packaging: Protective presentation packaging

Note: The bar is manufactured from pressed-and-sintered Iridium sponge rather than being cast to full theoretical density. Its estimated bulk porosity describes the internal structure of the bar and does not indicate that 25% of its mass consists of impurities.

Limited Availability

With worldwide Iridium supply measured in only a few hundred thousand troy ounces annually, physical Iridium bullion occupies an exceptionally specialized market. [3]

Each Stack Platinum® Iridium bar is carefully packaged and shipped fully insured.

Own the rarest precious metal on Earth.

Scientific & Industry References

[1] U.S. Geological Survey — Rare Earth Elements: Critical Resources for High Technology (2002)

Gordon B. Haxel, James B. Hedrick and Greta J. Orris. Figure 4 compares the atomic abundance of elements in Earth's upper continental crust, identifying the platinum-group elements among the rarest metallic elements.

Original USGS Publication

View Atomic-Abundance Graph on ResearchGate

[2] Royal Society of Chemistry — Iridium, Element 77

Scientific information on Iridium's rarity, density, corrosion resistance, melting point and physical properties.

Royal Society of Chemistry: Iridium

[3] Johnson Matthey — PGM Market Report (2026)

Industry research and estimated global supply of Iridium and other platinum-group metals.

Johnson Matthey: PGM Market Reports

[4] European Commission — Critical Raw Materials Factsheets (2020)

Scientific and economic research on Iridium production, mineral occurrences and supply concentration.

European Commission: Critical Raw Materials Study

[5] NASA — Radioisotope Power Systems: Technology Overview

NASA's documentation of Iridium protective cladding used around plutonium-238 fuel in spacecraft radioisotope power systems.

NASA: Radioisotope Power Systems