I am eyeing on this Ruby ring on an auction side. Except for the tiffany stamp there is no box or certification. Any sharp eyes here? For the stamp, the strange thing is that there is no @c before the Tiffany & Co stamp. Not sure if it’s common or not. Any other signs to know whether it’s authentic Tiffany or a knockoff? Also I am pretty sure the Ruby is heated and possibly from Mozambique.

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