Board Thread:General Discussion/@comment-25392320-20140906171308/@comment-5089372-20140906192344

Your paying for an increased chance to breed diamond dragons (and diamond hybrids).

Once you buy the Diamond Temple it is only active for 7 days. When the 7 days are over it can be repowered with gold (usually 300), it then takes effect for another 7 days.

The increase in chance is small and people have reported still needing to spend several 100 gold speed breeding while it is acive to get their Diamonds. So, personally I would not recommend purchasing the temple unless you have some gold for speed breeding while it is active.