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Yes! I have also not seen bolsters over ivory, not that it hasn't been done!
Now look at the graining and the feel of each. Tap the material on a front tooth. You can tell there as well!

Good info! A hot pin would not differentiate ivory from bone and, if hot enough, would badly mark or possibly set celluloid on fire! Pictures are really best. IMO, the OP should carefully study the...

Looks like the 3 on the right are ivory in the first pic, Definitely not the 2nd one down in the second pic. JMO