Rhodium plating is the electroplating of a thin rhodium layer onto white gold, platinum or sterling silver to give the surface a bright, hard, reflective white finish. Global rhodium demand reached 1,063,000 troy ounces (1,063 koz) in 2025, of which automotive catalysts took 899 koz, or 84.6%, according to Johnson Matthey's PGM Market Report (May 2026), so jewelry plating draws on a metal whose real market sits under the hood of a car, not on a jeweler's bench. What rhodium plating is, how it is applied, how long it lasts and what US law says about disclosing it follow below, section by section.
What Is Rhodium Plating?#
Rhodium plating is a surface treatment, not a solid jewelry metal: rhodium (Rh) is too brittle to cast, and it traded above $5,000 per troy ounce through most of 2025, peaking near $12,000 in late February 2026, according to Johnson Matthey's PGM Market Report (May 2026), far too costly for bulk metal. Manufacturers instead deposit a few atoms' worth of it onto a base metal. Rhodium plating sits inside the wider uses of platinum group metals in industry and jewelry alike.
Rhodium: The Metal Used for Plating#
Rhodium has the symbol Rh, atomic number 45 and CAS number 7440-16-6, with a density of 12.423 g/cm3 and a melting point of 1,964°C (2,237 K), according to Wikipedia's rhodium entry and PubChem's element record. Those constants explain why plating, not casting, is the only practical way to use rhodium in jewelry: a metal that melts above 1,960°C and trades at four figures per troy ounce is not one a jeweler casts into a ring shank. The full profile of rhodium (Rh), element 45, covers its chemistry beyond plating.
Why Rhodium Plates White Gold, Platinum and Silver#
Rhodium plates jewelry metals because it is hard, silvery and highly reflective, with a face-centered cubic structure, giving white gold, platinum and sterling silver a brighter, more scratch-resistant surface than the base metal alone. Rhodium is also chemically resistant, insoluble in nitric acid and only slightly attacked by aqua regia, so a plated surface resists household acids far better than an unplated one. Three properties make rhodium the standard plating metal, listed below.
- Reflectance: the highest of the commercially plated platinum group metals, giving a brighter white than the base alloy underneath.
- Hardness: a harder surface than white gold, platinum or silver, so the plating resists everyday scratching.
- Chemical resistance: insoluble in nitric acid and only slightly attacked by aqua regia, so the layer itself does not tarnish.
Rhodium's properties, covered in full on rhodium's properties, are what a plater is buying whenever a plating bath quotes a rhodium price.
How Rhodium Plating Works#
Rhodium plating is applied by electroplating from a rhodium salt solution, most commonly rhodium sulfate or rhodium(III) chloride, at a low current density that deposits a thin, hard rhodium layer on the piece. Rhodium(III) chloride trihydrate, CAS 13569-65-8, is the standard rhodium electroplating precursor, according to Wikipedia's Rhodium(III) chloride entry, since the anhydrous salt is essentially inert and will not dissolve into a working bath. The piece is cleaned, lowered into the bath as the cathode, and a direct current draws rhodium ions out of solution and onto its surface. Rhodium sulfate plating solutions and rhodium(III) chloride are the two salts used to make that bath.
Bright Rhodium vs Black Rhodium Plating#
Black rhodium plating produces a darkened, matte-to-charcoal finish instead of rhodium's natural bright white, used on pieces meant to look deliberately dark rather than reflective. DailyPlatinum has not located a primary source for its exact bath chemistry and states only that a darkening additive changes the deposit's color, without naming which additive or process is used. Rhodium plating kits and rhodium plating solutions exist for small-scale and DIY use, but this page names no specific product and endorses no process for at-home plating.
Rhodium Plating Thickness, Durability and Re-Plating Intervals#
Rhodium plating is typically 0.75 to 1.25 microns thick (some sources cite up to 2.0 microns) and lasts 1 to 3 years on a ring before it wears through to the base metal, based on retail-aggregated ranges rather than a single plating standard. A micron is one-millionth of a meter, thinner than a human hair, so the entire working layer between a "like new" white gold ring and its yellow or grey base alloy is a coating a fraction of the width of a strand of hair. The typical range and how it compares to daily wear are set out below.
| Parameter | Value | Class |
|---|---|---|
| Typical plating thickness | 0.75 to 1.25 microns (up to 2.0 microns cited by some sources) | Retail-sourced range, not a plating standard |
| Comparison | Thinner than a human hair | Illustrative |
| Wear life on a ring | 1 to 3 years, typical | Retail-sourced range |
How Long Rhodium Plating Lasts#
Rhodium plating wears fastest on high-contact pieces such as rings and bracelets, and slowest on low-contact pieces such as earrings and pendants, which can go years without replating. A ring meets a hand's friction, soap, grit and knocks every day, while an earring rarely touches anything else, so the same 0.75 to 1.25 micron layer can wear through in a year on a ring yet last a decade on a stud. Skin chemistry and how tightly a ring fits also change the wear rate, which is why retailers quote a range rather than a single figure.
Re-Plating Cost and Why It Moves With the Rhodium Price#
Re-plating a ring commonly costs $50 to $150 in the United States (a wider $35 to $125 range is also cited) and AUD 89 to 270 in Australia, a range that widens when the rhodium price itself is volatile. Johnson Matthey's PGM Market Report (May 2026) tracks rhodium moving above $5,000 per troy ounce in early 2025 to a peak of $12,000 in late February 2026, then retreating toward $10,000 by March, a swing that a plating bath's metal cost tracks directly. The typical charge in each region is set out below.
| Region | Typical re-plating cost | Range source |
|---|---|---|
| United States | $50 to $150 (also cited as $35 to $125) | Retail-aggregated |
| Australia | AUD 89 to 270 per piece | Retail-aggregated |
A jeweler's re-plating quote bundles the rhodium metal itself with labor, cleaning and polishing, so current rhodium price moves the metal share of the bill while labor stays fixed. Rhodium's price more than doubled between early 2025 and its February 2026 peak, and rhodium market volatility explains why the minor PGM swings so much further than platinum or gold in percentage terms.
Rhodium Plating on White Gold, Platinum and Silver#
Rhodium plating on white gold exists because white gold is not naturally white: its pale yellow or greyish alloy color is engineered white by the rhodium layer, while platinum is naturally white and does not need it. Nickel white gold uses rhodium plating as a temporary barrier over an alloy that can irritate sensitive skin, and once the plating wears through, the ring returns to direct nickel contact until it is replated. Palladium white gold, used as an alloying metal since 1939, produces a naturally white alloy that does not require rhodium plating at all, an option some buyers choose to avoid both the recurring cost and the nickel question. Sterling silver takes rhodium plating for a different reason: not to change its color, but to protect it against tarnish, according to Wikipedia's rhodium entry. The three cases compare as follows.
- White gold: needs plating for color; nickel white gold also gains a temporary nickel barrier from the layer.
- Platinum: naturally white; plating is cosmetic or absent, never required for color.
- Sterling silver: naturally white already; plating adds tarnish resistance rather than color.
The fuller purity and durability comparison between the two white metals is on platinum vs white gold, and how plating is used on jewelry metals generally is on rhodium and platinum plating on other metals.
US Disclosure Rule for Rhodium-Plated Jewelry#
Buyers see rhodium plating disclosed in the US because federal rule requires it: 16 CFR § 23.7 states it is unfair or deceptive "to fail to disclose a surface-layer application of rhodium on products marked or described as precious metal." The Federal Trade Commission's Jewelry Guides place this requirement in a separate provision from 16 CFR § 23.6, which governs fineness marking of platinum, rhodium and the other platinum group metals, so a retailer must clear both rules, not just one. A ring stamped "950Pt" or "14K" that also carries a rhodium finish must say so; the finish is a coating, not part of the metal's declared fineness, and hiding it is exactly what the rule forbids.
Rhodium Plating FAQ#
Is rhodium plating good, and does it tarnish?#
Rhodium itself does not tarnish: it is chemically inert to acids and does not react with air or skin oils, but once the thin plating layer wears through, the base metal beneath it can tarnish or irritate skin. Rhodium's own resistance, insoluble in nitric acid and only slightly attacked by aqua regia, is real; the risk sits in the base metal it eventually exposes, not in the rhodium layer itself.
What are the disadvantages of rhodium plating?#
The disadvantages of rhodium plating are a recurring re-plating cost, a color that shifts once the layer thins, and, on nickel white gold, renewed skin contact with nickel once the barrier wears through. Three drawbacks recur across the ranges cited above, listed below.
- Recurring cost: re-plating every 1 to 3 years on a ring adds up over a lifetime of ownership.
- Color shift: the piece looks progressively less bright and less white as the layer thins.
- Renewed nickel contact: on nickel white gold, once the barrier wears through, skin sensitivity can return.
Can you shower with rhodium-plated jewelry?#
Showering does not damage rhodium plating chemically; the layer wears mechanically, from friction and abrasive contact, not from water. Water, soap and normal handwashing are not what thins a rhodium layer; a gym towel, a kitchen counter and a tight-fitting ring are.
What is rhodium's symbol, atomic number and CAS number?#
Rhodium has the symbol Rh, atomic number 45 and CAS number 7440-16-6. Its full property set, from density to melting point, is covered on rhodium (Rh), element 45.
Related Rhodium Pages#
Rhodium plating connects to rhodium's other industrial uses and to the scrap market that recovers it, both covered on dedicated pages. Rhodium's uses beyond plating covers the automotive catalysts that took 899 koz, or 84.6%, of 2025 rhodium demand, next to plating's small, undocumented share. Rhodium scrap and recovery covers how worn plating and spent catalysts are recovered and refined back into metal.