Sorry, professor_x I do not know where to buy the pink ivory veneer!
I buy my veneer at several different places, but I have not seen pink Ivory veneer!
I bought a chunk of pink ivory at Woodcraft store and then cut it down!
My suggestion to you is to buy, a chunk of it and cut it or have someone cut it, a band saw is really nice for that type of cut.
Sorry I could not help more, if you are just wanting a pink color, I would look into Woodcraft as they have a dyed veneer that is pink!
Sounds like it is going to be a pretty ring, make sure to post the finished product so we all can see!!
Good Luck!