(urth) Creating the Claw

[Dave Tallman]

All the interesting discussion on how to forge Terminus Est leads me to
think of another question. Sev dropped off his plain rose thorn in the past.
Centuries later, it shows up in the center of a sapphire. I know there are
techniques for creating synthetic corundum crystals, like the Vereuil
process and hydrothermal synthesis, but they seem to involve high heats and
pressures. How could the gem be created without burning up the thorn? Also,
how could it be centered?
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