Rhodium

Rhodium – Properties, Rhodium Plating, and Uses in Jewelry

First published on June 5, 2019 – comprehensively revised and technically updated on September 10, 2026.

Many jewelry wearers encounter rhodium without even realizing it. Rhodium is used as an ultra-thin electroplated coating, particularly on white gold and silver. It creates a very bright, white, and shiny surface and can protect the underlying metal from oxidation or tarnishing.

However, rhodium is not simply a coating or a chemical additive, but a precious metal in its own right from the platinum group. In its solid form, however, it plays hardly any role in jewelry. Its particular significance lies in rhodium plating.

What Is Rhodium?

Rhodium is a chemical element with the symbol Rh and atomic number 45. Together with platinum, palladium, iridium, ruthenium, and osmium, it belongs to the group known as the platinum metals.

The metal has a bright silvery color, is highly corrosion-resistant, and is characterized by high hardness and a very high melting point. Its density is approximately 12.4 g/cm³, and its melting point is about 1,963 °C.

Due to its properties, rhodium is used in various technical fields. For goldsmiths, however, one application is particularly important: the electroplating of jewelry surfaces.

What does rhodium plating mean?

In rhodium plating, a very thin layer of rhodium is applied to a finished piece of jewelry. This is done electroplating, that is, using an electrolyte and an electric current.

The rhodium layer deposited in this process is extremely thin. For decorative jewelry applications, typical layer thicknesses range from a few tenths of a micrometer, depending on the process and requirements.

Rhodium plating therefore does not alter the fundamental construction of the piece of jewelry. It is a surface finish.

Why is jewelry rhodium-plated?

A rhodium layer can serve several functions:

• It creates a very bright and uniform white surface.
• It has a strong metallic luster.
• It is very hard and relatively scratch-resistant.
• It can protect silver from direct contact with air and thus prevent tarnishing.
• In white gold, it can produce a particularly bright and neutral white tone.

It’s important to note, however, that a rhodium layer does not make a piece of jewelry scratch-resistant. While the coating itself is very hard, it is extremely thin. Signs of wear will still develop with daily use, and the rhodium layer can wear away over time in areas subject to heavy stress.

Rhodium and White Gold

Rhodium plating on white gold is particularly well known.

White gold is not a naturally white form of gold, but rather a gold alloy. Pure gold, which is naturally yellow, is lightened by adding specific alloying metals.

Depending on the alloy used, white gold still has a slightly warm, gray, or yellowish undertone. A rhodium layer can transform it into a significantly lighter and more uniform white surface.

That is why it is important to distinguish between the two: white gold and rhodium are two different materials. A rhodium-plated white gold ring is still made of white gold. Rhodium is present only as a very thin layer on its surface.

Does white gold always have to be rhodium-plated?

No. Whether white gold is rhodium-plated depends on the specific white gold alloy and the desired appearance.

Rhodium plating is particularly useful when a very bright, brilliant white surface is desired. However, there are also pieces of jewelry where the natural color of the white gold is intentionally left visible.

From a goldsmith’s perspective, one should therefore not automatically assume that every high-quality white gold piece of jewelry must be rhodium-plated.

Rhodium on Silver

Silver is also frequently rhodium-plated.

Silver can tarnish due to reactions with sulfur-containing substances in the environment, resulting in dark discoloration. This is a normal property of the material and not a quality defect.

A rhodium coating isolates the silver surface from the environment and can thus significantly reduce tarnishing. At the same time, the piece of jewelry takes on a very bright, even surface.

An example from our goldsmith’s workshop: the Mokume Gane “Kora” pendant

A specific example from our workshop is the Mokume Gane Kora Pendant.

The visible Mokume Gane element of the pendant consists of 750 yellow gold, 500 palladium, and 925 silver. The supporting base of the piece is made of 925 silver and protected against tarnishing with a rhodium coating.

This clearly illustrates the purpose of rhodium in goldsmithing: It is not the actual material that defines the design, but rather a specifically applied surface finish.

How long does a rhodium plating last?

There is no fixed timeframe for this.

How quickly a rhodium plating wears off depends, among other things, on the type of jewelry being worn, the amount of mechanical stress its surface is subjected to, and the thickness and durability of the applied layer.

In everyday life, a ring is exposed to significantly more friction and contact with objects than, for example, a pendant or a pair of earrings. For this reason, the rhodium plating on rings can wear off much more quickly.

As a rhodium plating wears away, the color of the underlying metal gradually becomes visible again.

Can jewelry be rhodium-plated again?

In many cases, yes.

Before rhodium plating can be reapplied, the surface must be properly prepared. Scratches and signs of wear do not disappear simply by applying a new layer of rhodium.

Depending on its condition, the piece of jewelry is therefore first cleaned, restored, and, if necessary, polished. Afterward, a new layer of rhodium can be electroplated.

For rings with diamonds or complex designs, it’s important to determine beforehand which restoration method is technically feasible.

Is rhodium harder than gold or silver?

Rhodium is very hard in its deposited form. Electroplated rhodium coatings can achieve hardness values that are significantly higher than those of traditional gold or silver alloys.

Nevertheless, this does not mean that rhodium-plated jewelry is practically scratch-proof. The key factor here is, once again, the thinness of the coating.

In the event of a deep scratch, not only the rhodium coating but also the much thicker base material beneath it can be deformed.

Is jewelry made from solid rhodium?

In everyday goldsmithing, practically never.

Although rhodium has interesting properties, using it as a solid jewelry material is technically challenging and economically impractical. Its high melting point, mechanical properties, rarity, and price all argue against its use as a traditional solid jewelry metal.

In jewelry, therefore, we almost always encounter rhodium as a coating.

Where is rhodium used outside of jewelry manufacturing?

The most significant application of rhodium in terms of volume is not in the jewelry industry, but in automotive engineering. There, the metal is used in catalytic converters, particularly to reduce nitrogen oxides.

In addition, rhodium is used in various industrial processes and specialized technical applications due to its chemical resistance and catalytic properties.

While this industrial significance is interesting for a jewelry guide, it should not distract from the application that matters most to customers: rhodium plating.

Rhodium at a Glance

Frequently Asked Questions About Rhodium and Rhodium-Plated Jewelry

Is rhodium a precious metal?

Yes. Rhodium is one of the platinum-group metals and is related to platinum and palladium.

What does “rhodium-plated” mean when it comes to jewelry?

“Rhodium-plated” means that a piece of jewelry has been electroplated with a thin layer of rhodium. The base metal remains, for example, white gold or silver.

Why is white gold rhodium-plated?

A rhodium coating creates a particularly bright and uniform white surface. In contrast, the natural color of a white gold alloy can appear slightly warmer or grayer, depending on its composition.

Why is silver rhodium-plated?

A layer of rhodium can shield silver from direct contact with substances in the environment, thereby significantly reducing the typical tarnishing.

Does rhodium wear off?

Yes. Although rhodium is very hard, the layer used on jewelry is very thin. Especially on rings, it can wear off over time due to friction and daily wear.

Can a rhodium plating be renewed?

In many cases, yes. Before doing so, the piece of jewelry should be professionally cleaned and, depending on its condition, restored.

Is rhodium-plated jewelry scratch-resistant?

No. The rhodium coating is hard and abrasion-resistant, but it does not prevent normal signs of wear or deeper scratches in the underlying jewelry metal.

Our Conclusion from the Goldsmiths

Rhodium is less interesting for jewelry as a solid precious metal than it is as a high-quality surface finish. A rhodium plating can make white gold appear particularly bright and effectively protect silver from tarnishing.

At the same time, it’s important to understand what a rhodium coating cannot do: It does not make jewelry indestructible or permanently scratch-free. Especially for rings worn frequently, the coating is a surface that will change over time and can be renewed as needed.

For more information on jewelry metals, alloys, and their properties, please visit our guide section on precious metals.