433MHz sounds like ISM. Are you stuck with the 13.56MHz crystal? If it is for ISM, there are many ICs out there which do the bulk of the work for you (ADI, Radiotronix, RFM, HopeRF, etc).
If you just need the clock, look at IDT or Maxim for clock generators (these have built-in PLLs and VCOs to generate your frequency from the xtal/clock input).