Titanium Grade 23 (Ti-6Al-4V ELI)
Aerospace grade alloy, Ti-6Al-4V ELI
Dark silver-grey, naturally matte. Anodising produces a full spectrum of colours through thin-film interference without pigments
Composition
90% titanium, 6% aluminium, 4% vanadium, Extra Low Interstitials medical/aerospace grade
Physical properties
| Density | 4.43 g/cm³ | Weight per unit volume. Platinum is ~40% heavier than 18k gold at equal size |
|---|---|---|
| Melting range | 1604–1660 °C | Working temperature for alloys. Pure metals have a sharp melting point |
| Vickers hardness | 340 HV | Higher HV = greater scratch resistance in service |
| Mohs hardness | 6 | Approximate equivalent for comparative reference |
| Tensile strength | 895 MPa | Resistance to breaking under tension, relevant for prongs and fine settings |
| Tarnish resistance | Excellent | Surface oxidation / sulphidation under typical wear conditions |
| Workability | Moderate | Ease of forming, soldering, and fabricating under standard jewellery workshop conditions |
| Hypoallergenic | Hypoallergenic | Likelihood of triggering skin reactions under normal wear |
Common uses
Medical implants (the gold standard for biocompatibility), contemporary rings, lightweight watches and frames, body jewellery, anodised coloured jewellery
Hallmarking & identification
No precious metal hallmark applicable. May be stamped Ti, TITANIUM, or Grade 23. Cannot be soldered with standard jewellery techniques; requires laser welding or mechanical assembly.
Extremely durable and corrosion-resistant. Clean with mild soap and water. Anodised colours may fade with abrasion; these colours are structural, not painted, and cannot be easily restored without equipment.
Market & pricing
Raw material is inexpensive compared to precious metals. Fabrication cost is the primary driver, as specialist equipment is required. Final retail price often comparable to 14k gold pieces.