"Created by lining up 5 gems of the same color. Fires lightning in 4 directions when matched!"
— Bejeweled Twist, mouseover description
Lightning Gem is a type of Special Gem that first appeared in Bejeweled Twist. It is the predecessor of the Star Gem that later appeared in the Bejeweled series starting with Bejeweled Blitz; although it also appeared in Bejeweled Blitz LIVE, which borrowed the method used to create a Star Gem, as a consistency with the theme of Bejeweled Twist that it is based on. It has an appearance of a gem with a lightning effect based on its color.
It is created by matching either five gems in a row (in Bejeweled Twist and the Twist mode of Bejeweled Blitz LIVE) or five (or more) gems in an "L", "T", or "+" intersecting match (in Bejeweled Blitz LIVE, which doing so in Bejeweled Twist creates a Flame Gem instead). When detonated, it destroys all gems along its x-axis and y-axis.
The affirmation that it sends lightning in four different directions is not necessarily true. The player can make a Lightning Gem in the top right corner and if it is triggered while in the same place, it will send lightning in two ways. Or making it fall a slot (or more) will make it send lightning in three ways.