1 Troy Ounce Rhodium Bar

One of Earth's Rarest and Most Valuable Precious Metals

Own Something Extraordinary

Rhodium is one of the rarest naturally occurring precious metals on Earth, distinguished by its extraordinary scarcity, brilliant silvery-white appearance, and exceptional physical properties.

Discovered in 1803 by English chemist William Hyde Wollaston, Rhodium takes its name from the Greek word rhodon, meaning rose, inspired by the distinctive rose-colored compounds encountered during its discovery. [1]

Far rarer in Earth's crust than Gold or Platinum, Rhodium occurs in extremely low natural concentrations and is recovered primarily as a byproduct of platinum-group-metal mining and refining. Its supply is inherently linked to the production of other metals rather than determined by demand for Rhodium alone. [1, 2]

Each Stack Platinum® bar contains over one troy ounce of 99.9+% pure Rhodium, offering a rare opportunity to own an extraordinary physical precious metal.

Exceptional Scarcity

Rhodium occupies a remarkable position among the world's precious metals.

One of Earth's rarest precious metals, occurring in exceptionally low natural concentrations. [1]

Annual primary mine supply of only approximately 700,000 troy ounces, compared with more than 100 million troy ounces of Gold mined annually. [2, 3]

Produced primarily as a byproduct of platinum-group mining and associated refining operations. [2]

A specialized physical bullion market with limited availability compared with conventional Gold, Silver, and Platinum products.

Industrial demand concentrated in essential catalytic and high-performance applications. [1, 3]

Johnson Matthey's 2025 market report estimated global primary Rhodium supply at approximately 691,000 troy ounces, illustrating the remarkably small scale of its annual mine production. [3]

Rhodium's rarity is not manufactured. It is a consequence of Earth's geology and the extreme limitations of its natural production.

Exceptional Properties

Rhodium possesses a combination of physical characteristics that few metals can match.

Brilliant Reflectivity: A highly reflective, silvery-white metallic surface valued for precision optical coatings and specialized reflectors. [1]

Extraordinary Corrosion Resistance: Exceptional resistance to chemical attack and oxidation under many conditions. [1]

High Melting Point: Approximately 1,963°C (3,565°F). [1]

Remarkable Durability: A hard, wear-resistant precious metal used in demanding industrial and decorative applications. [1]

High-Performance Catalysis: Outstanding catalytic properties essential to important chemical and automotive processes. [1, 2]

These characteristics make Rhodium valuable far beyond its use as a precious metal.

Essential to Modern Technology

Despite its scarcity, Rhodium plays a vital role in several important industries.

Automotive Technology

Rhodium is particularly effective at facilitating the reduction of nitrogen oxides in vehicle exhaust systems. This makes it a critical component of catalytic converters used in gasoline-powered vehicles. [1, 2]

Aerospace and Advanced Engineering

Rhodium's heat resistance, chemical stability, and reflective properties make it useful in specialized high-temperature alloys, precision coatings, electrical contacts, and advanced engineering applications. [1, 4]

Scientific and Industrial Applications

Rhodium is also used in chemical catalysts, temperature-measuring thermocouples, optical reflectors, electrical contacts, and platinum-rhodium alloys for high-temperature industrial equipment. [1, 4]

Its remarkable combination of scarcity and industrial utility distinguishes Rhodium from traditional investment metals.

A Distinguished Addition to a Precious Metals Collection

Gold and Silver have served as stores of tangible wealth for centuries. Rhodium offers something fundamentally different: ownership of a precious metal with an exceptionally small primary supply and highly specialized global market.

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

Ownership of an extraordinarily scarce physical metal.

Diversification beyond conventional bullion.

Exposure to a highly specialized platinum-group-metal market.

A distinctive combination of natural rarity, industrial importance, and tangible value.

The physical Rhodium bullion market is substantially less liquid than the markets for Gold and Silver. Buyers should consider potentially significant dealer spreads and price volatility.

Rhodium stands apart as an exceptionally rare precious metal, distinguished by its extraordinary scarcity, industrial importance, and enduring physical properties.

Authenticity You Can Verify

Every Stack Platinum® Rhodium bar is accompanied by documentation supporting its purity and composition.

Each bar includes:

Certificate of Analysis (COA).

Spectrometer analysis report.

Documented 99.9+% Rhodium purity.

Custom Stack Rhodium protective presentation box.

These documents provide additional transparency and confidence when acquiring an exceptionally rare precious metal.

Specifications

Metal: Rhodium (Rh), Platinum Group Metal

Weight: Over 1 Troy Ounce

Purity: 99.9+% Rhodium

Dimensions: Approximately 30 mm × 30 mm × 3.5 mm

Documentation: Certificate of Analysis and spectrometer report included

Packaging: Custom Stack Rhodium protective presentation box

Availability: In Stock — Ready to Ship

Limited Availability

Unlike conventional bullion, investment-grade Rhodium bars are rarely encountered in mainstream precious-metals markets.

With annual primary production measured in hundreds of thousands rather than millions of ounces, Rhodium represents an exceptionally scarce tangible asset. [3]

Each bar is carefully packaged in its custom Stack Rhodium presentation box and shipped fully insured.

Own something extraordinary. Stack Rhodium.

Scientific & Industry References

[1] Royal Society of Chemistry — Rhodium, Element 45

Scientific properties, natural abundance, discovery, reflectivity, corrosion resistance, industrial applications, and melting point.

Royal Society of Chemistry: Rhodium

[2] U.S. Geological Survey — Platinum-Group Elements

Research covering the geological occurrence, concentrated production, extraction, and industrial importance of Rhodium and other platinum-group metals.

USGS: Platinum-Group Elements

[3] Johnson Matthey — PGM Market Reports, 2025–2026

Industry research documenting global Rhodium mine supply, secondary recycling, industrial demand, and market conditions.

Johnson Matthey: PGM Market Reports

[4] National Institutes of Health / PubChem — Rhodium

Chemical and industrial uses including catalysts, high-temperature alloys, reflectors, electrical contacts, and precision scientific equipment.

PubChem: Rhodium