I received an email from a player today who asked me whether the hearts displayed in the Individuals List would change colour according to heart level. This made me realise that Harvest Moon traditions that many of us take for granted probably need to be explained to some beginners.
In fact, the hearts displayed in the Individuals List next to each character's name do not change colour. Hearts for any character eligible for marriage will be red and all other characters will be green. (I believe the hearts next to your child's name may be red as well.)
When you speak to any individual who is eligible for marriage in your game, you will see a heart on the screen itself. That heart will be black in colour when you first meet the character. As you 'raise' or increase his/her heart level, it will change colour. Each 'heart level' represents a specific number of points:
Eligible Bachelors and Eligible Girls:
0 to 10,000 points: Black Heart
10,000 to 20,000 points: Purple Heart
20,000 to 30,000 points: Blue Heart
30,000 to 40,000 points: Green Heart
40,00 points to 50,000 points: Yellow Heart
50,000 points to 60,000 points: Orange Heart
60,000 points to 65355 points: Red Heart
And the other character heart levels...
0 Hearts: 0 to 25 Points
1 Heart: 26 to 50 Points
2 Hearts = 51 to 76 points
3 Hearts = 77 to 101 points
4 Hearts = 102 to 127 points
5 Hearts = 128 to 152 points
6 Hearts = 153 to 178 points
7 Hearts = 179 to 203 points
8 Hearts = 204 to 229 points
9 Hearts = 230 to 254 points
10 Hearts = 255 points
If your character is a girl, there is an exception in the person of Shea, who never has any heart displayed on the screen. You can access the Individuals List at any time, however, to see what his actual Heart Level is. Two hearts, for example, represents 'Purple Heart' Level.
At deepest red heart level, the eligible Bachelor/Girl will be at a minimum of 60,000points or 10 hearts.
This system is common to most Harvest Moon games. In some games, like HM DS/Cute DS, you can purchase an accessory that, when equipped, will show you the precise number of points earned in Affection or Friendship with each individual. Island of Happiness has the Individuals List but no Accessory that displays precise totals in terms of points.