The Gem Of A Joker slot will be available with William Hill Vegas until September when it will launch with all Live 5-partnered mobile casinos. Studio's latest blockbuster slot features new jackpot bonus that awards Multipliers of between x5 and x2, the player's stake. Online gambling is illegal in some. Studio's latest blockbuster slot features new jackpot bonus that awards Multipliers of between x5 and x2, the player's stake. Grab 10 Free Spins to play a trio of fun-filled games, each day you stake € Choose from: Gem of a Joker Instapots™ · Starlite Fruits™. Grab 10 Free Spins to play a trio of fun-filled games, each day you stake € Choose from: Gem of a Joker Instapots™ · Starlite Fruits™. Developer Live 5 has announced the launch of its new slot Gem Of A Joker InstaPots exclusively with William Hill Vegas. . Special Features.