Diversification

Diversification is one of the founding principles of modern portfolio theory. In 1952 the economist Harry Markowitz formulated mathematically what investors had long understood intuitively: spreading wealth across weakly correlated assets lowers overall risk without necessarily sacrificing return. Precious metals — above all gold and silver — play an important role in this concept, as they frequently act as a safe haven during periods of stress in the equity markets.

Systematic and unsystematic risk

Financial theory distinguishes two types of risk:

• Unsystematic (specific) risk: affects individual companies or sectors — e.g. a corporate scandal or a sector-specific slump. This risk can be almost entirely eliminated through diversification.
• Systematic (market) risk: affects the entire market — e.g. recessions, interest-rate turns or geopolitical crises. This risk cannot be diversified away, only mitigated by adding uncorrelated asset classes.

Precious metals have historically shown a low to negative correlation with equities and bonds, especially in times of crisis. This makes them an effective building block in a diversified portfolio.

Dimensions of diversification at a glance

Precious metals as a diversification building block

Within the precious-metals asset class, further spreading is advisable. The gold-silver ratio shows the historical price relationship between the two metals and can give indications of relative over- or undervaluation. Beyond gold and silver, platinum and palladium may be considered — these are more strongly industrial and therefore have different price drivers.

The formula for portfolio risk with two assets illustrates the diversification effect:

σ_P = √( w₁²·σ₁² + w₂²·σ₂² + 2·w₁·w₂·ρ₁₂·σ₁·σ₂ )

σ_P  = portfolio risk (standard deviation)
w    = weighting of the asset
σ    = individual risk of the asset
ρ₁₂  = correlation coefficient between asset 1 and 2

The lower ρ₁₂ (down to a minimum of −1), the stronger the risk-reducing effect of the mix.

Practical implementation with precious metals

A precious metal savings plan enables the gradual build-up of a precious-metals position and uses pound-cost averaging: through regular purchases at varying prices, high-price phases and cheaper entry points balance out. This considerably reduces timing risk.

Common recommendations from institutional investors suggest a precious-metals share of 5–15% of the total portfolio. This guideline, however, depends heavily on individual risk tolerance, investment horizon and the overall structure of the portfolio. Note: this does not constitute investment advice.

The tax dimension

For physical precious metals in the United Kingdom, gains from a sale are subject to Capital Gains Tax (CGT). UK legal-tender coins from The Royal Mint — such as the Sovereign, Britannia, Lunar and Queen's Beasts — are CGT-exempt with unlimited gains, because they are UK legal tender. Non-legal-tender coins and gold bars are subject to CGT on gains above the annual exempt amount (gain = disposal proceeds − acquisition cost). There is no German-style one-year speculation period. ETCs and certificates are generally taxed within the wider investment framework, irrespective of holding period.

Differences also matter at the point of purchase: investment gold (bars and coins with a fineness of at least 995/1000) is exempt from VAT in the UK (HMRC; in line with Directive 2006/112/EC). Silver, platinum and palladium, by contrast, are subject to the standard VAT rate of 20%. This difference noticeably affects the effective cost base of a precious-metals diversification. Note: this is not tax advice — individual review by an accountant is recommended.

In brief

Diversification lowers portfolio risk by combining weakly correlated assets — precious metals contribute a stabilising element, because in times of crisis they often move in the opposite direction to equities and bonds. A broad mix of different metals, forms of holding and asset classes is more effective than concentrating on a single asset.