more informations in Wikipedia article: Ivory
Ivory refers to the substance of the tusks of elephant, mammoth and other animals such as. Walrus, sperm whale etc.
Since 1973, no trade in ivory has been allowed thanks to the conservation agreement.
Only a few have the permission to work with ivory.
It used to be reserved for the rich to own cubes of ivory. The material was scarce and expensive.
In the meantime, cubes are only available at high prices on antique markets.
The typical reticular grain has only the ivory of the trunks. This differs by arrangement of the intersecting lines. This structure, also called Retzius' or Schreger's lines, shows different angles of intersection, which the connoisseur can recognize with the naked eye.
The following data are indicative:
- Ivory angle: 100 - 120 degrees
- Mammoth angle: 80 - 90 degrees
- Mastodon angle: 40 - 50 degrees
- Ivory: about 1.7-1.85 g / cm3
- Mammoth: about 2.0-2.2 g / cm3