This is a pre-cut, stabilized woolly mammoth tusk cross-cut section (Mammuthus primigenius).
This slab can be cut, drilled, sanded, polished etc. to achieve the desired result. The colour of the ivory is a mix of purple, red and black.
Geological epoch: Pleistocene.
Age: Over 10,000 years.
Origin: Sakha Republic (Yakutia).