Personally, I don't think that BitCoin Diamond will provide any value in the future. Basically it's BitCoin with a higher supply, but like BitCoin Gold because it mines on GPU's. It's just a bad clone and I won't take part in it, even if there's "easy" money to be made.
But that's just me.
RE: Bitcoin Diamond Already in Top4 Coins By MarketCap! And How Easy Is To Manipulate This.