6. Diamond
Gold and other precious metals have been the most common thing to buy for investment. The value of gold will only keep rising as time goes by. Same goes to diamond.
Diamond offers higher value than gold and it looks even better. This unbreakable material is popular among jewelry enthusiasts. Diamond goes in ring, necklace, tiara, and even teeth.
Rich people own diamond mostly as a piece of jewelry. However, some of them do collect diamonds as investment or as a trading instrument with fellow rich people.
To get you the idea of how expensive a diamond could be, take a look at the Hope Diamond at the Smithsonian Museum of Natural History in Washington DC. It is a 45.52 carats diamond with the value of $350 million for only 9 grams.
