I have a friend who is posting on Facebook looking for diagrams for very early faceted gems.
She was looking for diagrams that match stones from the Cheapside Hoard, But I am not hopeful that anyone might have done the math to match these at this point.
I was hoping as this forum has thousand of experts from from all over the world, that someone might have come across some references or documentation that could help her. even if it is a reference that might help her design her own faceting diagrams. I can only pass on information as faceting is not in my wheelhouse due to the complex math needed.
Basically anything pre-industrial era would be helpful.
Thanks in advance for the help and advice.