I'm sure everyone has thought of this, and it's time someone suggests it(Couldn't find anything around). As of the current time, diamonds are locked out of crates and rank kits. The only option for a newcomer to obtain a diamond is from crates or interacting with the economy, which might be overwhelming at the start. A simpler and more engaging way for these players to obtain one is through mining their generators. Of course this shouldn't be just handed out for free and I recommend that the rates are significantly low so it doesn't affect the price too much. Coal : 0.88% | Copper : 0.14% | Lapis : 0.12% | Gold : 0.08% | Redstone : 0.05% | Iron : 0.03% | Chance for an ore : 1.30% Since Iron : 0.03% I'd recommend Diamond be : 0.00125% (24x rarer) I honestly think it could be even lower, but technically, if the rates from /generator are correct, you would have to mine almost a thousand ores before you're on rate for a diamond. I'm not including emeralds as these serve no purpose whatsoever in this server, befitting more their current source only being from crates.
If this suggestion is to help new players get a kickstart in Skyblock this surely isn't the way. With your recommended odds for diamond ore (1/80,000) against the standard ore generator everyone makes at the start, it will have very little impact towards new players. This addition would only help those who have fast and automatic ore generators. And of course, newcomers don't easily have access to use these machines. You could lower the odds, but do too much and it would only contribute to lowering a diamond's value which I'm sure many don't want ending up like iron.
You can easily make an ore generator with /chall resources and moss being given away for free, but yes, you could also easily make grass for diamonds if u adapt quick to the economy too. In the end the big farms would be the one benefitting the most since they can afk longer, altho they still have to mine all those ores. Unfortunately you have no way around it and yes, if anything, this would help richer players more than newcomers. Since they didn't add diamonds into the nether loot from the nether chests however, I'm not sure how they could introduce diamonds in another way. If you got any better suggestion to add them please feel free to share. Economy can easily buy anything out of the shop, including all ores like diamond, and you guys can also get diamonds from daily quests. This was more of a thought on skyblock because they're kinda of locked behind a "paywall", but I guess it wouldn't bother anyone if it was added to economy!