Aerial heart

Description: A magic stone with the heart of a flying demon birds.

Aquired:
Dante - M2 (Final chamber, you won't miss it)
Lucia - M2 (First chamber, you won't miss it)

Quick heart

Description: A magic stone with the heart of a running demon beast.

Aquired:
Dante - M4 (In the rooMnorth of the striking globe)
Lucia - M8 (After clearing the moving globe puzzle)

Aqua heart

Description: A magic stone with the heart of a swimming demon fish

Aquired:
Dante - None
Lucia - M7 (Second chamber)

Flame heart

Description: A magic stone with a fierce flame demon.

Aquired:
Dante - M7 (Fly up the center of the stairs)
Lucia - M5 (Same way)

Frost heart

Description: A magic stone with a beautiful ice demon.

Aquired:
Dante - M16 (Top right optional chamber on your map)
Lucia - Default

Electro heart

Description: A magic stone with the heart of a proud lightning demon.

Aquired:
Dante - Default
Lucia - M5 (After using the Evil Heart)

Healing heart

Description: A magic stone with the heart of a merciful goddess.

Aquired:
Dante - M11 (After solving the statue puzzle)
Lucia - M3 (The rooMnorth of the striking globe)

Chrono heart

Description: A magic stone with the heart of old god who lived for eternity.

Aquired:
Dante - M15 (Kill an enemy on top of the one eye that does NOT show itself; weird mark on ground)
Lucia - M11 (Same way)

Offense heart

Description: A magic stone with the heart of a vigorous battle god.

Aquired:
Dante - M5 (In the area with the infested tanks, run back (away from the tanks) to the end where there're lots of huge debris and jump over them into a hidden area. Go around the fence through the opening on the top right and you'll find it there by the wall.)
Lucia - M4 (The lower path)