Hello, Charles. “Jarina” is what we use when substituting ivory, here
in Brazil. It is a seed from a palm that has the color of ivory and
it is smooth enough for carving images. If you type “jarina” in
Google Images, you will see lots of images. You might try to get
samples of it there in Australia, in stores that sell imported stones
and fossiles. Best regards, Evelise.
Evelise Gonsales Pimenta Azimonte