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I wouldn't call it rare. It was used commonly for razor scale, less common for brush handles. When polished up it can look great and can also be dyed different colors. I have a razor with Giraffe...

It looks like bone to me.

An Ivory brush? This one is genuine.

It doesn't look like Ivory at all and ivory would only be used in top of the line Badger brushes. It has always been a luxury material.