old marble or onyx slab display bases, pair of large round polished stone stands

Pair of undrilled stone rounds, marble or mexican onyx? These might be plant or jar stands or lamp risers, and would work nicely for either purpose!

They're almost 1" thick, and are 6 1/4" in diameter. Both have some wear and scuffing to the polished finish, and slight edge roughness to the stone.