I am seriously thinking of commissioning a simple tungsten cube emblazoned with cuneiform style figures, set up on a stainless steel platform. For the legacy. For someone millions of years from now.
Stainless steel is stains less not rusts never. You would need additional measures to keep the stand from degrading over thousands of years. Your local archeology department could give you some pointers on how to accomplish that.
Or maybe you design the stand in such a way that the tungsten object is held firmly, but still easily visible in rusty stainless jaws.