Originally Posted by
arlflyer
OP will probably stay there after getting Diamond, just doesn't want to do 30 without it if they don't have to.
There are also Diamond and Gold Challenges that Hilton runs from time to time. You do need to stay a few nights, but if you already have a credit card that gives you Gold, it will be easy to get Diamond as well.
Amex Surpass and Citi Reserve both give you Gold w/o any spending, and once you spend $40,000/year you get Diamond for that calendar year + 1 more calendar year + 3 months. So if you spend your $40,000 now, you will have it for 2015, 2016 and through 3/31/2017.
Cheers,
PedroNY