The Diamond Mystery Box.
The Diamond Mystery Box was a reward given to players when they leveled up from Level 51 - Level 150. From Level 151 onwards, the reward changed to the Platinum Mystery Box. Since March 2016, Big Viking Games extended the levels to 500 and dropped both Diamond and Platinum Mystery Boxes. Instead, players receive YoCoins, YoCash and also unlock new actions and dances as they level up.
This box contained either coins, cash or rare items. These items include: