Pair top of vases made of horn

Pair of vases made of horn, probably of zebu.
They are in excellent condition and they have been polished.
They are the same top height but one of them is wider than the other.
Very decorative in an industrial style home and rare to find in this size.
Be aware that it would be better to put a glass inside if you want to use them as vases.
They could also be transformed in lamps.
Height: 23 cm or 9"