Never use plumber putty on granite or marble — it stains permanently

Plumber putty contains oils that penetrate porous natural stone within hours, leaving a dark ring that cannot be removed without professional refinishing. Per the Marble Institute of America guidelines, use 100% silicone caulk rated for stone surfaces on any granite, marble, or quartzite countertop penetration. This applies to faucet bases, drain flanges, and soap dispensers.