Luck
Gemstones associated with drawing Luck to the wearer in all forms of Gaming, such as cards, horse racing, bingo, slot machines, etc.

Jade : Bring Luck and Wealth.
Alexandrite : Gemstone for Luck.
Amazonite : Bring Luck. Break an unlucky streak.
Green Aventurine : Luck in Gambling.
Cats Eye : Very lucky for gamblers.
Jade : Thought to bring luck & Prosperity.
Labradorite : Used in luck charms.
Moldavite : Moldavite is thought to bring luck.
Mother-of-Pearl : Bring wealth.
Opal : Thought to bring back luck if not October born.
Sunstone : Luck and Optimism in love.
Tiger Eye :Luck for gamblers.
Turquoise : Considered Lucky by many cultures.