Chronostone is a limited edition type of Rare Gem in Bejeweled Blitz. It resembles a golden stopwatch. When the game begins, the game board will feature a random basic gem that has a stopwatch on it. This unique gem removes all surrounding gems in a diagonal formation, adds two extra seconds to the Timer Bar, and gives 10,000 points when it is cleared from the board. Clearing more gems throughout the game causes more gems with stopwatches on them to appear.