Alloy Identification

Alloy Name: 18ct Red Gold

Alloy Type: Red Gold

Gold Purity: 75.0%

Karat Rating: 18 Karat (18ct)

Appearance: Warm reddish metal with enhanced copper content.

Elemental Composition (by weight)

Note: Copper and zinc contribute to the red color and strength; silver balances the alloy.
Exact proportions of the base metals have been omitted to protect the proprietary alloy.

Physical Characteristics

• Color: Rich reddish hue
• Density: ~15.5–16.2 g/cm³
• Melting Range: 1,020–1,060°C
• Hardness (Vickers): ~130–150 HV (annealed)
• Workability: Good for casting and fabrication
• Tarnish Resistance: Moderate; may darken or patina over time

Applications

This alloy is commonly used for:

• Jewelry with a warm red tint (rings, bracelets, earrings)
• Artisan and designer pieces requiring unique color
• Durable yet aesthetically appealing fine jewelry

Conclusion

The 18ct red gold alloy contains 75% fine gold and 25% base metals including copper, silver, and zinc. This combination delivers the classic red coloration, good mechanical properties, and traditional jewelry aesthetics.