How do you collect diamonds on CoinMarketCap?

Excuse me, but I'm a bit confused about something. I've been hearing about this platform called CoinMarketCap, and I understand it's a popular destination for tracking the prices and performance of various cryptocurrencies. However, I've come across some chatter about collecting diamonds on CoinMarketCap, and I'm not quite sure what that means. Could you please clarify how one goes about collecting diamonds on this platform? Is it some sort of reward system or a unique feature of the site? I'd appreciate any insight you could provide.