Diamond Arctic Ice is so clear because it's free of trapped gas bubbles and other impurities.
In the 1800s, bartenders were inventing the cocktail and ice was getting easier to ship and store. The ice in these drinks was cut from lakes and ponds and came out clear as glass because of a natural phenomenon known as “directional freezing.”
Because a lake is insulated on all sides except the surface, ice can only freeze in one direction – from the top down. As water freezes, the molecules align in patterns and begin to form ice crystals. Ice crystals are less dense than the water around them causing them to float, pushing air and impurities down into the denser water below and leaving the top with solid, clear ice.
Diamond Arctic Ice uses this same "directional freezing" process to make the world's clearest craft ice!