AFAIK the inner core of sperm whale tooth (made from dentin) has a yellowish colour and shows concentric rings but of course this may vary from one specimen to another and depending on the age of the piece.
The 2 attached Bugis hilts from Sulawesi are made from sperm whale ivory I think (other opinions are welcome) and they show a deep yellow patination.
Regards
PS: See the yellow core of the largest (broken) tooth shown by Ganja Iras
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