DarkSphere, formerly known as a Dark Hypercube, is a special gem exclusive to Bejeweled Stars. It is created by making a horizontal or vertical match of 6 or more gems, only possible during a cascade. It carries the appearance of a rotating sphere with swirls orbiting the gem itself.
When swapped with a normal gem, it turns all gems of the same color into Hypercubes. When swapped with other Special Gems:
Matching gems in a big T shape with 5 in a line and 2 to the side (ie, three horizontal and five vertical) of the middle gem will only create a Hypercube since Bejeweled Stars only allowed 1 special gem to be created per gem matching.