If you land the Collect symbol at the same time as the instant prize and the safe symbol, you may experience one of the following upgrades:
Cash Blitz, aka the Green Diamond feature. It will add more cash symbols to the playing grid.
Win Boost, aka the Purple Diamond. This option boosts all instant cash values in view.
Super Collect, aka the Red diamond. It will collect and reward all cash values in view.
Bullion strike, aka the Gold Diamond. This feature will update the minimum value cash symbols to bullions and/or cashpots.
Safe symbol may drop only on reels 2, 3, 4 and 5.