Red Gold
Also: Red Gold, Copper Gold
A gold alloy carrying a substantial share of copper, red gold takes on a distinctive reddish, warm bronze-like colour thanks to that copper.
To make red gold, jewellers blend copper into pure gold on purpose, sometimes together with a little silver depending on the recipe. That copper masks gold's natural yellow warmth and pushes the colour towards anything from a gentle rosy tint to a deep, near-coppery red. More copper means a stronger red. Because both metals feed the calculation, keeping an eye on the gold price and the copper price matters when you work out what red gold jewellery is worth by weight — the melt value calculator draws on both figures.
Composition and Fineness Values
How red the piece looks comes down to the proportions of the alloying metals. These mixes turn up most often:
| Fineness | Gold content | Copper content | Silver content | Colour effect |
|---|---|---|---|---|
| 333 (8 carat) | 33.3% | up to 60% | remainder | Strongly reddish-copper |
| 585 (14 carat) | 58.5% | 35–41% | 0–6% | Vivid red-golden |
| 750 (18 carat) | 75.0% | 25% | 0% | Warm reddish-golden |
Where no silver is present, you get classic red gold showing the most intense red. Introduce silver and the tone drifts toward rose gold, a softer pastel pink that sits apart from the bolder red gold. The boundary is not sharp, and the trade sometimes swaps the labels red gold and rose gold, even though — technically — they describe different copper levels.
Calculating Melt Value
To find the material worth of a red gold item you look at the fine weight of the gold; the copper contributes so little that valuations normally ignore it. The calculation runs:
Melt value = gross weight (g) × fineness (‰) / 1000 × gold price (£/g)
So a ring weighing 10 grams in 585 red gold holds 5.85 g of fine gold. Use the gold calculator to pull the current per-gram figure.
Properties and Processing
Adding copper toughens gold alloys and makes them far more resistant to wear than plain fine gold (999). At 585 fineness, red gold takes solder, stamping and engraving readily. For jewellery, that extra hardness pays off — rings and bracelets in red gold cope with everyday knocks better than yellow-gold pieces.
That said, the heavy copper share carries a few downsides:
- Tarnishing: Exposed to damp air, copper oxidises, so red gold can develop a faint tarnish as the years pass — although ordinary jewellery-cleaning products deal with it.
- Allergy risk: Alloys rich in copper may irritate sensitive skin, which is why 750 red gold, with its lower copper share, suits sensitive wearers better.
- No protective coating: Red gold has no extra shielding layer, unlike rhodium-plated white gold.
Distinction from Related Alloys
| Term | Main alloying metal | Typical tone |
|---|---|---|
| Rose gold | Copper + silver | Pastel pink |
| Red gold | Copper (higher than rosé) | Warm red-copper |
| Yellow gold | Silver + copper balanced | Golden yellow |
| White gold | Palladium or nickel | Silvery-white |
Market and Purchasing
For buying and selling, the one thing that sets the value is the fineness — that is, how much gold is present. A standard precious metal purchase pays nothing separately for the copper or silver. Running the numbers through the buying price calculator beforehand gives you a realistic idea of what red gold jewellery should fetch. Bear in mind: in the United Kingdom, profits from selling gold jewellery can attract Capital Gains Tax once you exceed the annual exempt amount, and there is no German-style one-year speculation period — none of this is tax or investment advice.
In Brief
The warm, reddish look of red gold comes from the copper deliberately built up in the gold alloy. As the fineness moves from 333 up to 750, so do the colour, the hardness and the melt value — and you can work out that melt value easily with the melt value calculator.