How do you know if this is Jet, Bog Oak, Vulcanite or Gutta Percha and what ARE all those things anyway? This no nonsense blog tells all, including a SHOCKING way to identify jet!
http://www.jewelrynerd.org/blog.html
Antique Victorian LOCKET Black Mourning Jewelry Watch CHAIN Tassel, Whitby Jet Gutta Percha Bog Oak Vulcanite, Memorial MEMENTO Mori 1870’s