Cash assets and capital investments often yield lower returns, which is why investing in stable assets becomes increasingly sensible. Diamonds above one carat are considered crisis-proof; they are the most compact form of wealth protection in the world and have always shown significant value appreciation surpassing inflation rates. The price of diamonds has consistently risen in the long term, as the demand for diamonds has always exceeded the supply. 

When considering diamonds as an investment, they should be acquired exclusively with an internationally recognized certificate, preferably a GIA certificate. This makes any potential resale much easier. Many investors solely purchase diamonds that have a GIA certificate.