The number six implies responsibility and diamonds relates to finances. Six of Diamonds Birth Card people are keenly aware of debts and their repayment. Like all sixes they receive exactly what they put out. They may fall into slumps as a result of their inertia so they need to remember to prod themselves into action. Once they get going, they can attain most anything they desire. There is protection in work and action.
On a deeper level, the Six of Diamonds is here to settle karmic debts from past lives. Finances can go from one extreme to the other in this process. If they accept what they inwardly know, they will always be happy whatever the circumstances in their life. If they have discovered their special mission in life, they will not worry about how much money they have.
These people make great teachers. They are givers and can be entrusted with great responsibility. What they have to give is a clear knowledge of values and discrimination.