A Diamond is a type of investment that is gaining popularity with investors. Diamonds are an informal term for an index-based exchange-traded fund (ETF) known as the SPDR Dow Jones Industrial Average ETF. The SPDR Dow Jones Industrial Average ETF seeks to provide investment results that, before expenses, correspond generally to the price and yield performance of the Dow Jones Industrial Average Index. This means that when you invest in a diamond, you are buying into a fund that mirrors the movements of the Dow Jones Industrial Average Index.One reason diamonds have become popular investments is because they offer liquidity. This means you can buy and sell them on stock exchanges just like any other type of security. Another reason diamonds have become popular is their low fees relative to some other types of investments such as mutual funds or individual stocks and bonds. Finally, many people believe that investing in diamonds can help reduce portfolio risk because these securities tend to be less volatile than some other types of investments.