Clear ice is made by controlling the direction of freezing — typically by insulating all sides of the water except the top so that freezing progresses downward, pushing air and impurities ahead of the ice front and out the bottom. The result is ice that is optically transparent, extremely dense, and significantly slower-melting than standard tray ice. A single large clear cube in an Old Fashioned or a straight spirit is both functional (less dilution) and intentional-looking. Standard freezer ice is cloudy because air and minerals are trapped as the water freezes in all directions simultaneously.
Why It Matters
Clear ice is slower to melt, which means slower dilution — better for spirit-forward drinks served over ice that are meant to be sipped slowly. It also signals care. A beautiful clear sphere in a glass of good whiskey communicates that the drink was made intentionally.
Where You'll Use It
Old Fashioneds, Negronis, spirit-forward drinks over a single rock. Large clear cubes or spheres in double rocks glasses.
Worth Knowing
Large Cube / King Cube
A large cube (often called a king cube) is a 2-inch square ice cube, typically made with a silicone mold. The large surface-area-to-volume ratio means it melts more slowly than smaller ice, providing less dilution over time. It's the standard for spirit-forward cocktails served over ice and for any drink where slow dilution is desirable.
Sphere Ice
A sphere of ice melts even more slowly than a cube of equivalent volume because a sphere has the lowest surface-area-to-volume ratio of any shape. Sphere molds produce a single round ball of ice, typically 2 to 2.5 inches in diameter. Primarily aesthetic, but the physics are real.