Amp Stands - Wood or Stone

The best form of isolation is Symposium Ultras with your 

component coupled to it with the metal pucks

Mechanical and airborn vibration/energy  is dissipated as heat and drains through the component into the pucks and ultimately  into the Symposium.I have 6 under all my components.  The earlier above comment  is simply that wood does not drain vibration 

and stone rings and does not absorb and convert the vibration  energy to heat

the original question was “ what’s a good amp stand”.

Really any stand that is rigid and on spikes preferably.  
vibration control is an entirely different conversation

Good luck Willy -T 

Livevibe all the way

https://livevibeaudio.com/audio-points-coupling-discs/

And there isn't really any true "isolation" possible on the planet earth

I've experimented with stands and footers over a number of decades, I've probably tried virtually every kind of material out there. Only you can determine which solution best for you, this is part of tuning one's system. In general the material used will kind of tell you what to expect, soft delivers softer more diffuse sound, hard will tighten up things. I've also found a rather unique solution for some of my equipment in using high test monofilament fish line hung from custom built stands, this closest to no stand, footer solution I've found. This delivers most natural timbre, tonality, micro and macro dynamics, natural decay, etc. This method allows the most sympathetic movement with vibrations, and the least editorializing of the myriad solutions I've tried.

See if you can get some of that fancy Cardas wood but beware, if the price per inch is equal to what they charge for those tiny cable supports (that do nothing for the sound), you'll be shelling out big $$$.