A sexy way to "brand" large ice cubes. And, it looks AMAZING sitting in an Old Fashioned glass. It's just another way to "elevate" the guest experience through discovery.
I've used a company called Stamptitude with great luck. They mostly make brass stamps for pressing into wax, but they also make ice stamps. (When ordering, be sure to click "for ice", as the indentation needs to be the deepest setting.) Brass works extremely well as it conducts heat, so one just barely needs to press down on the cube for 2 seconds and voila! It's done!
NOTE: The stamps don't pick up small writing very well. It's best when used for logos or simpler designs.