If there is an "investment" side to diamonds, it exists only at the extreme top of the market.
The question of whether diamonds are a "good investment" is a complex intersection of marketing, psychology, and harsh economic reality. Unlike gold, which is a fungible commodity with a standardized global price per ounce, diamonds are highly subjective assets with significant barriers to liquidity for the average retail buyer. The Retail Reality is buying diamonds a good investment
Selling a diamond usually requires a middleman who will take a cut. If there is an "investment" side to diamonds,