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Why Investing Success Lies in a Well-Diversified Portfolio

Dec 13, 2023
5 min read
Written by Diamond Standard


Diversifying your assets reduces risk and increases the opportunity for higher returns. This concept isn't merely a suggestion from financial advisors; it's a well-documented approach supported by extensive research and historical market performance data.

This guide explores the importance of creating a diversified investment portfolio, its advantages, and how it can protect your assets from unpredictable market swings.

The Foundation of Diversification

At its core, diversification involves spreading investments across various asset classes, industries, and geographical regions. The rationale behind this investment strategy is simple: different investments will perform differently under varied market conditions. By diversifying, investors can mitigate the risks of having all their eggs in one basket.

Studies show that high-net-worth households often achieve a good level of diversification by investing directly in many different assets. Such a strategy can lead to lower volatility and higher returns—desirable outcomes for any investor.

Another study suggests that a well-diversified portfolio of randomly chosen stocks should include at least 30 to 40 stocks, depending on whether the investor is borrowing or lending.

The Role of Bonds in Diversification

Bonds have also historically played a pivotal role in portfolio diversification. They tend to move inversely to stocks, making them a hedge against equity market downturns. The relationship between Treasury bonds and U.S. stocks has changed significantly over the years.

In the 1980s and 1990s, if stock prices fell, bond prices also appeared to plunge, and if stocks rose, bonds followed suit. However, beginning in the early 2000s, this pattern changed. Now, when stock prices go down, bond prices often increase, which helps stabilize investment portfolios.


Fixed-income securities, such as bonds and bond funds, play a crucial role in dampening the overall volatility of a portfolio. When interest rates go up, the prices of existing bonds may drop. However, the income generated may help compensate for any dips in other parts of your investment mix.

Investors can consider including fixed income in their asset allocation, adjusting the proportion as they become more risk-averse with age or changes in financial circumstances.

Investors must be mindful of the duration of their bond investments. Short-term bonds are generally less sensitive to interest rate changes than long-term bonds. By including a mix of short, intermediate, and long-term bonds, investors can manage interest rate risk while enjoying the benefits of fixed income in their portfolios.

The Impact of Globalization on Diversification

Globalization has opened the doors for investors to tap into international markets, which can offer a combination of imperfectly correlated returns across countries. This global spread can result in lower market volatility and will likely benefit investors from each market explored. The interplay between domestic and international stocks can create a balanced portfolio that weathers different economic storms.

In a well-diversified portfolio, geographical diversification is a critical element. By investing in markets across different countries and regions, an investor can benefit from the varying economic cycles and market conditions around the world.

Emerging markets, for example, can offer higher growth potential, although they come with more significant risks than developed markets. Including a mix of both can balance the overall risk and return profile.

Emerging markets are an essential component of geographical diversification. They often provide a counterbalance to the mature economies of developed nations. While they may be more volatile due to factors like political instability or less mature financial regulations, they also offer the potential for higher returns.

A diversified portfolio with a measured allocation to emerging markets can harness this growth potential while managing the additional risk.

How Diversification Mitigates Market Volatility

The primary purpose of portfolio diversification is not to maximize returns but to limit the impact of volatility. A well-diversified portfolio can cushion against the market's wild swings, providing a more stable growth trajectory.

For instance, a hypothetical aggressive portfolio with 60% U.S. stocks, 25% international stocks, and 15% bonds had a 9.45% average annual return. However, its range of returns varied greatly. By adjusting the asset allocation to include more bonds and short-term investments, the portfolio's volatility decreased, offering the average investor a more palatable risk profile.

The Quantifiable Cost of Not Diversifying

A recent study found that investors who did not diversify their portfolios missed out on potential returns of up to $172,000 over 10 years. This staggering figure underscores the tangible diversification benefits.

In comparison, a diversified portfolio returned an average of 8.5% per annum, while an undiversified portfolio focused solely on the U.S. stock market returned an average of 5.5% per annum.

Over the long term, diversification can lead to more stable and predictable portfolio performance. While it cannot eliminate all risks, a diversified portfolio is less likely to experience extreme fluctuations in value.

This stability is essential for investors nearing retirement or with specific financial goals, such as saving for a down payment on a home.

Portfolio Diversification Strategy Components

A comprehensive diversification strategy should encompass a variety of asset classes and investment vehicles, including but not limited to:

  • Stocks: A domestic and international mix across different market caps and sectors.
  • Bonds: Government, corporate, and international bonds provide fixed income and stability.
  • Mutual funds and Exchange-traded Funds (ETFs): Allow investors to buy a diversified portfolio of stocks or bonds in a single transaction. This can be an efficient way to diversify without buying and managing many individual securities. Index funds, which track a market index, are a popular type of mutual fund and ETF that offer broad market exposure.
  • Alternative Investments: Natural resources, precious metals, and others that do not correlate closely with stock and bond markets.
  • Money Market Funds: Cash equivalents that offer liquidity and lower investment risk.

Exploring Alternative Assets for Diversification Beyond Stocks and Bonds

When diversifying an investment portfolio, investors have traditionally turned to a balanced mix of stocks and bonds. However, the term "alternative investments" is increasingly prominent in an evolving financial landscape. Often uncorrelated with conventional investment products, these assets range from hedge funds and private equity to real estate and commodities.


Consider how incorporating alternative investments into your portfolio can safeguard against market downturns and potentially enhance returns.

Hedge Funds and Private Equity

Hedge funds aim for aggressive growth, capitalizing on various strategies, including leveraging and derivatives. Meanwhile, private equity offers a stake in non-publicly traded companies, often requiring more extended commitment periods but with the potential for substantial rewards. Both hedge funds and private equity have high entrance barriers, typically reserving spots for accredited or institutional investors.

Real Estate

Real estate as an alternative investment often brings stability through asset appreciation over time, rental income, or investment vehicles like REITs (Real Estate Investment Trusts). It is one of the most accessible alternative assets for individual investors, whether buying property directly or through pooled funds.

Real estate investment trusts (REITs) allow individual investors to invest in property without directly buying or managing real estate. This asset class often provides both income in the form of dividends and potential capital appreciation. As part of a diversified portfolio, REITs can offer a hedge against inflation and an alternative source of returns.

Commodities and Collectibles

Commodities such as oil, precious metals, and agricultural products offer investment opportunities that can hedge against inflation. Meanwhile, collectibles, from fine art to vintage wines and classic cars, provide intrinsic value and the joy of ownership. However, their markets can be more subjective and less liquid.

Private Markets and Venture Capital

The expansion of private markets and the vitality of venture capital allow investors to tap into start-up innovation and growth before a company goes public. These investments typically carry higher risks but promise substantial returns if the businesses succeed.

Fixed Assets

Alternative fixed-income strategies, like private credit and direct lending, are gaining traction as they often yield higher interest payments than traditional fixed-income markets. However, they may present more complex tax structures and less liquidity.

Precious Metals and Stones

Gold, silver, diamonds, ruby, sapphire, and other precious metals and gems are a captivating addition to the alternative investment landscape.

Diamonds, for instance, are a $1.2 trillion natural resource historically uncorrelated to stocks. Diamonds also bear a negative correlation to gold. They've proven their stability and growth, adding sparkle to investment strategies while balancing and securing portfolios against inflation and market volatility.

With new technologies facilitating diamond investment and trade, diamonds represent an emerging asset class that brilliantly captures the essence of diversification and enduring value.

In making the case for diamonds, we observe their historical resilience and prospects for appreciation. While precious metals have intrinsic value, diamonds offer a store of value and a potential hedge with their inherent beauty and rarity.

The burgeoning interest in diamond investments, backed by sound certification and market transparency, positions them as a compelling choice for the diversified investor.

When to Diversify?

The optimal timing for diversification is a topic of debate, but several principles can guide an investor's decision:

  1. Buy when the market is down: Investing in assets during downturns can position an investor for gains when the market rebounds.
  2. Invest Regularly: Regular investments can help capitalize on both upswings and downturns in the market.
  3. Avoid Market Timing: Building a diversified portfolio aligned with one's investment goals and risk profile is preferable to attempting to time the market.

Managing Risk Through Asset Allocation

Asset allocation involves spreading an investment portfolio across different asset categories. This decision is primarily based on the investor's risk tolerance, investment goals, and time horizon. By allocating assets strategically, investors can manage risk and increase the likelihood of achieving their financial objectives.


Every investment carries some level of risk. A well-diversified portfolio aims to achieve a balance between risk and return. Higher-return assets typically come with more significant risks, while lower-risk investments generally offer modest returns. Diversification allows investors to blend higher and lesser risk assets to create a portfolio aligned with their risk tolerance.

The Importance of Continuous Rebalancing

A diversified portfolio is not a set-it-and-forget-it proposition. It requires ongoing management and rebalancing to ensure that the asset allocation remains consistent with the investor's goals and risk profile. Market movements can cause an asset allocation to drift from its target, so periodic adjustments are necessary.

Diversification in Different Life Stages

The need for diversification changes as an investor moves through different life stages. Younger investors typically have a longer time horizon. They may tolerate more risk, leading to an asset allocation with a higher percentage of stocks. As investors approach retirement, they may shift towards a more conservative allocation with an increased emphasis on fixed income and cash equivalents to preserve capital.


Diversification can help investors minimize risk, manage volatility, and potentially enhance returns. By incorporating a variety of asset classes, geographical regions, and investment types into a portfolio, investors can create a foundation for long-term financial success. While there are no guarantees in investing, portfolio diversification is an effective strategy to help investors navigate the market's uncertainties and work toward their financial security.

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and cryptos — and, of course, diamonds.

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