New evidence for the Arkenstone-Silmaril case

[Eönwë]

Originally Posted by Morthoron

In addition, Maglor and Maedhros rid themselves of their Silmarils along the shores of the Belegaer, not eastward over two mountain ranges and several hundred miles inland near Erebor; therefore, it really is nonsensical to even have this discussion. Silmarils do not have the ability to fly, which is what would be required to support such a hypothesis.

Just to play devil's advocate...
If the Silmaril really did get carried by magma, couldn't it easily get carried by the convection currents in the mantle? (If we assume that Middle Earth at that point worked in the same way that our world does.)