My apologies: Non-Native-American objects are posted here, but it’s for the sake of furthering the discussion of how to identify ivory.
Here are two antique ivory objects, personally owned by me and not for sale. The ivory has been professionally verified and the age of the pieces has been certified to be more than 100 years old.
The miniature portrait is from the 1790s, probably from the Continent. You can see how the texture of the ivory works beautifully with the brushwork applying the paint, giving it a sort of grainy, dreamy softness.
The glove stretcher is probably from the 1880s-1890s. The striations are pretty apparent, even in my not-so-great photo.
Here’s a full-length picture of the glove-stretcher, in case you have never seen this object before. A good glove was a tight-fitting glove, like Spanx for the hand. This made a new pair bearable. Your wealthy urban person during the height of the 19th century never went out in society with bare hands like a laborer and went through many pairs of gloves yearly, since they had to be perfectly clean and they were really hard to clean.