How do you know if this is Jet, Bog Oak, Vulcanite or Gutta Percha and what ARE all those things any
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 -- source link
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