Diamonds
Diamonds are another currency used by players of Mafia Block, they are obtained in a few ways:
Voting links
Bought with paypal
Bought with in game cash from other players
Given in Don's favor package
Diamonds have their own market throughout the game, they can be spent in the Don's market on items, a rocket laucher and armed guard.
Diamonds are worth between 7mil-12mil depending on the buyer and seller.