Alloy Identification

Alloy Name: 18ct White Gold

Alloy Type: White Gold

Gold Purity: 75.0%

Karat Rating: 18 Karat (18ct)

Appearance: Bright white metal, suitable for high-end jewelry applications.

Elemental Composition (by weight)

Note: The base metal group includes copper, silver, and zinc, used to enhance hardness, color, and durability.
Exact proportions of the base metals have been omitted to protect the proprietary alloy.

Physical Characteristics

• Color: Silvery-white
• Density: ~15.2–15.5 g/cm³
• Melting Range: 1,060–1,100°C
• Hardness (Vickers): ~120–150 HV (annealed)
• Workability: Excellent for casting and fabrication
• Tarnish Resistance: High (due to palladium content)

Applications

This alloy is typically used in:

• Fine white gold jewelry (rings, bracelets, necklaces)
• Luxury watch casings and components
• Jewelry settings requiring both strength and whiteness without rhodium plating

Conclusion

The sample meets the standard specification for 18ct white gold, with 75% fine gold content and a palladium-enhanced base to achieve whiteness and corrosion resistance. The inclusion of minor base metals contributes to improved mechanical performance and durability.