Gem of Knowledge

The Colosseum Coin Collector now sells several levels of xp gems ranging from 1 million xp to 100 million xp. (There is also the Greater Gem of Knowledge which gives 100% of a level up to Lvl 170 or a max of about 515 million xp.)
 * Gem of Knowledge (100M) (100 Million)
 * Gem of Knowledge (50M) (50 Million)
 * Gem of Knowledge (20M) (20 Million)
 * Gem of Knowledge (9M) (9 Million)
 * Gem of Knowledge (3M) (3 Million)
 * Gem of Knowledge (1M) (1 Million)