Arctic Rocks...$16.99 / set of 6Chills Whiskey without watering it down.
"Finally, Whiskey on the rocks—no melting!
Watered-down whiskey is now a thing of the past. These ice cube alternatives made from hand-cut granite keep whiskey cool without ever diluting it. Effective at retaining temperature for extended periods of time. Safe, natural, non-porous, odorless, and flavorless. Includes travel pouch.
Rinse before use. Store in the freezer for at least 4 hours before use. Add 3 stones to a glass. Pour until liquid has reached the height of 1 stone (about 2 fl. oz.). Let stand for 5 minutes. Enjoy. Rinse after every use and air-dry. Store in the freezer for next time.
Do not chew or ingest. Intended for Whiskey and others spirits (such as Tequila, Gin, and Rum) only. Not intended for large volumes of liquid such as pitchers of iced tea or lemonade. Will not inadvertently scratch glass." - The Wine Enthusiast