A retention device for a vessel has a bottom portion affixed to a serving vessel with a first magnet contained therein, and a holder having a recess formed into a top surface and having a second magnet at a bottom of the recess, wherein the recess is formed in a size, shape and depth for receiving and releasably retaining the bottom portion through mutual attracting of the first and second magnets. In optional embodiments, the bottom portion may comprise a coaster, and the vessel may comprise a beverage tumbler. In other embodiments, the vessel may include a beverage glass, a mug, a stein, a plate, a cup or a bowl, and the holder's magnetic recesses may be formed in a tray, a table, a bar, a counter top, a shelf, a platter, a chair arm, or a cutting board.