Rhodium plating is a thin coat of rhodium, a white metal from the platinum group, applied over brass, alloy or silver. Makers use it because it gives a bright, cold white colour that resists tarnish and scratches better than silver plating does.
In imitation jewellery it is the standard finish for American diamond (CZ) pieces, bridal sets with white stones and Western designs that should look like white gold or platinum.
Why rhodium instead of silver plating
- Colour: rhodium is whiter and more reflective, which makes CZ stones look brighter.
- Tarnish: it does not darken in air the way silver does, so pieces look the same in the shop months later.
- Hardness: it is much harder than silver or gold, so it resists fine scratches.
- Skin contact: rhodium itself is not a common skin allergen, which helps on earrings and rings.
Cost and thickness
Rhodium is one of the most expensive precious metals, and its price can swing sharply. Makers therefore apply it in thin layers, and the plating line is a noticeable part of the cost of a white CZ piece. If a quote for rhodium-finished jewellery looks unusually cheap, the piece may have a silver-coloured or nickel finish instead.
A thin rhodium layer still wears through in time on high-friction areas, such as ring shanks and bangle edges. Thicker layers last longer and cost more. Ask the maker how they plate and whether they can share a thickness reading.
Watch the layer underneath
Rhodium is usually applied over an intermediate layer. Some workshops use nickel because it is cheap and gives a bright base. That matters if you sell in the EU or UK, where nickel release from items in prolonged skin contact is restricted. If the rhodium wears, the nickel underneath touches the skin.
Ask for a nickel-free underlayer, such as palladium or a suitable copper-based system, and confirm it with a nickel release test on the finished piece. The certifications and test reports guide explains which reports to ask for.
What this means for a buyer
Specify rhodium by name on the order, ask what sits under it, and test a finished sample for nickel release if you sell in Europe. Check the colour against your approved sample, since a weak bath gives a greyish or yellowish white.
Creston & Co works for buyers only, for a fixed fee agreed in writing. We check plating systems in Rajkot workshops, send samples to NABL-accredited labs and supervise packing. Ask for a free sourcing review.