I have WW diamond IC in my system since few weeks (all burned in) and have tried them between DAC to pre-amp and later between pre-amp and amp. They are very good with either of those. I don't have platinum IC to compare, but I like diamonds very much. I will plan to change all my ICs and may be power cords to WW diamonds.
They have very sharp focus, excellent clarity, wide and deeper soundstage, some airiness around the vocals, a bit more refined. Only cons was that it was a bit less meaty (or thinner) and less organic. But these are very minuscule cons and there is always trade off. Good luck.