Investment Grade Gold Bullion Bars are high-purity gold bars produced specifically for investment, wealth preservation, and institutional trading. They are manufactured by LBMA-approved refineries and meet strict international standards for purity, weight accuracy, and traceability.
These bars are globally recognized and traded across international bullion markets, making them one of the most secure, liquid, and universally accepted forms of physical gold ownership.
Chemical Composition
| Element | Typical Content |
|---|---|
| Gold (Au) | 99.5 – 99.99% |
| Silver (Ag) | Trace (ppm) |
| Copper (Cu) | Trace |
| PGMs / Others | Trace |
Key Physical Properties
| Property | Value |
|---|---|
| Density | 19.30 g/cm³ |
| Melting Point | 1,064 °C |
| Thermal Conductivity | ~318 W/m·K |
| Electrical Conductivity | ~70% IACS |
| Coefficient of Expansion | 14.2 × 10⁻⁶ /K |
| Magnetism | Non-magnetic |
| Corrosion Resistance | Excellent (noble metal) |
Mechanical Properties
Investment bullion retains the mechanical behavior of near-pure gold. Softness is expected and does not affect intrinsic value.
| Property | Typical Range |
|---|---|
| Hardness | 25 – 35 HV |
| Tensile Strength | 120 – 200 MPa |
| Yield Strength | ~100 MPa |
| Elongation | > 40% |
| Malleability | Extremely high |
Strengthening & Metallurgical Behavior
Crystal Structure: Face-Centered Cubic (FCC), enabling exceptional ductility.
Strengthening:
✔ Minor solid-solution strengthening from trace Ag/Cu
✔ Slight work hardening during casting
❌ No heat-treatment strengthening
Metallurgical Characteristics
✔ Homogeneous gold matrix
✔ No phase transformations
✔ No oxidation or corrosion
✔ Stable grain structure over time
✔ Infinite remelting without degradation
Refining & Processing
Typical Production Flow:
Doré reception → Miller refining → Wohlwill electro-refining →
induction melting → casting or minting →
precision weighing → assaying & certification →
stamping & serialization
Purity Levels:
99.5% → institutional minimum
99.9% → standard investment grade
99.99% → premium modern standard
Available Forms
✔ 400 oz London Good Delivery bars
✔ 1 kg bars
✔ 500 g / 250 g bars
✔ 100 g / 50 g bars
✔ 1 oz bars
Manufacturing Style:
Cast bars (institutional, lower premium)
Minted bars (retail, higher finish)
Applications
Investment & Finance
Wealth preservation, inflation hedge, portfolio diversification
Institutional Use
Central bank reserves, bullion banking, ETFs, exchange settlement
Refining & Manufacturing
Recasting into coins, jewelry, and smaller investment bars
Advantages of Investment Grade Bullion Bars
✔ Lowest premium over spot (especially large bars)
✔ High resale value
✔ Accepted without re-assay (accredited bars)
✔ No counterparty risk
✔ Tangible asset outside the financial system
Investment Bars vs Other Gold Forms
| Feature | Investment Bars | Coins | Jewelry |
|---|---|---|---|
| Purity | 99.5 – 99.99% | 90 – 99.99% | 58 – 99% |
| Premium | Lowest | Medium–High | Very High |
| Liquidity | Very High | High | Low |
| Purpose | Investment | Investment / Collectible | Ornamental |
| Assay Standard | Strict | High | Variable |
Why Choose Investment Grade Bullion Bars?
Investment grade bullion bars represent the most efficient, liquid, and globally recognized form of physical gold ownership. Their value is driven entirely by metal content, not craftsmanship, making them ideal for institutional reserves and serious long-term investors.