Gold alloys
24k Gold, Fine Gold
24 karats, 999.9‰ fine
Deep, rich yellow, the natural colour of pure gold, the benchmark all alloys are measured against
Composition
99.99% gold, no significant alloying elements
Physical properties
| Density | 19.32 g/cm³ | Weight per unit volume. Platinum is ~40% heavier than 18k gold at equal size |
|---|---|---|
| Melting range | 1064 °C | Working temperature for alloys. Pure metals have a sharp melting point |
| Vickers hardness | 25 HV | Higher HV = greater scratch resistance in service |
| Mohs hardness | 2.5 | Approximate equivalent for comparative reference |
| Tensile strength | 130 MPa | Resistance to breaking under tension, relevant for prongs and fine settings |
| Purity | 99.99% | Fine metal content by mass |
| Tarnish resistance | Excellent | Surface oxidation / sulphidation under typical wear conditions |
| Workability | Excellent | Ease of forming, soldering, and fabricating under standard jewellery workshop conditions |
| Hypoallergenic | Hypoallergenic | Likelihood of triggering skin reactions under normal wear |
Common uses
Bullion coins and bars, ceremonial and temple jewellery, electroplating base, dental applications, investment pieces
Hallmarking & identification
Stamped 999 or 999.9. Rarely used in wearable jewellery; too soft for everyday pieces. Standard for bullion and investment gold.
Care & maintenance
Extremely soft. Avoid contact with hard surfaces and abrasives. Clean gently with warm water and a soft cloth. Scratches easily and permanently.
Market & pricing
Spot price benchmark for all gold products; quoted daily on commodity exchanges (LBMA). Premium over spot applies for fabricated pieces.