Featured Edelweiss earrings what are these made of?

I think the yellowy darker ones are bone and the lighter ones celluloid, have I got it right?

Charity shop finds, along with a few other bits

 

all bone from what I can see.....

 

I’ve always thought more likely to be bone but there are ivory ones too, not sure about celluloid though.

 

Thank you

 

I've got these as earrings and brooches. Most bone, occasionally celluloid. Little souvenirs.