Rouge — The Final Polish for Gold and Silver
Rouge — The Final Polish for Gold and Silver
A fine red iron oxide compound used as the last abrasive stage in jewellery finishing
Rouge is a fine, red-coloured polishing compound based on iron oxide (Fe2O3) used as the final abrasive stage in the finishing of precious-metal jewellery and in the polishing of certain gemstones. Also called jeweller's rouge, the compound has been in continuous use since the eighteenth century and remains a standard bench-shop material for producing the high-gloss mirror surface expected on finished gold, silver, and platinum work.
Composition and grade
Jeweller's rouge is principally hematite — the alpha form of iron oxide — milled to particles typically below one micrometre in median diameter. The fine particle size makes rouge a true polishing compound rather than a cutting abrasive: the action is one of burnishing and ultra-fine surface refinement, removing the scratches left by the previous abrasive stage and producing a mirror finish. The red colour is the natural colour of hematite and has no functional significance beyond identification.
Rouge is supplied in several physical forms: solid bars or cakes pressed with a wax binder, loose powder, and pre-loaded buffs in which the rouge is impregnated into the buff fibres. The bar form is most common on the bench, where the polisher charges a felt or muslin buff by drawing the bar across the spinning wheel.
Use
Rouge is the final stage in a typical metal-finishing sequence that progresses from coarse abrasive (sandpapers, hard wheels with cutting compound), through medium abrasive (tripoli or bobbing compound on muslin or sisal wheels), to the rouge stage. The polisher applies rouge-charged buffs to the workpiece at moderate wheel speed and light pressure, allowing the fine particles to refine the surface progressively. Finishing is typically followed by ultrasonic and steam cleaning to remove residual rouge and buff fibres before the piece reaches the customer.
Different rouge grades and formulations are produced for different metals: red rouge is the standard for gold and silver, while white rouge (based on aluminium oxide rather than iron oxide) is preferred for platinum and white gold because the iron-oxide pigment can transfer to the metal as a faint discoloration. Green rouge (based on chromium oxide) is used for steel and stainless work; black rouge formulations are also produced for specific industrial applications.
In the trade
Rouge is a consumable bench-shop supply produced by a long list of manufacturers and sold through jewellery and watchmaking supply houses. The material is inexpensive, with a single bar typically lasting weeks or months of regular bench use depending on workshop volume. Rouge has no analogue in modern automated finishing — high-volume production lines use abrasive slurries and electrochemical polishing rather than rouge buffs — but the material remains essential to hand finishing in custom, antique-restoration, and bespoke workshop practice.