How do I craft boosters?

Blast is assembled from four precious stones of the same color that are arranged in a line. A Blast destroys a 3x3 area immediately after it is activated or removes one level from a blocking element.

Star is assembled from five precious stones that are arranged in a cross or L-shape. When activated, a Star destroys the vertical column and the horizontal row that intersect in the cell that the Star centers on. If a blocking element is in the Star's path, then one level is removed from it.

Lightning is assembled from five or more precious stones that are arranged in a line. When activated, Lightning destroys all the precious stones on the board with the same color as the Lightning's stone or removes one level from a blocking element.