When you’ve set your sights at 5 carats, diamond become scarce. This makes a 5 carat loose diamond perfect for investment purposes. When buying 5 carat diamonds as an investment you have to consider the rarity above all else. The rarer the diamond, the more secure your investment will be. On the other hand you also have to check if there is a market, what good is an investment if you are unable to find a buyer?
Another use for a 5 carat diamond could be custom-made jewelry like a necklace or ring that would make for the perfect family heirloom.