Diamond can be used for Attraction. Attraction is related to Like. Like is related to Foot. 
Suitable is a synonym of Happy. Happiness is derived from Happy. Happiness is a type of Mood. Mood is related to Sad. 
Diamond --UsedFor--> Attraction <--RelatedTo--> Like <--RelatedTo--> Foot 
Suitable <--Synonym--> Happy <--DerivedFrom-- Happiness --IsA--> Mood <--RelatedTo--> Sad 