7 represents the divine number of Goddess Mahalakshmi, the divine half of Lord Vishnu. When you are aiming towards a prosperous life, you should never give a thought about possessing and using a seven phased Rudraksha. 

Goddess Mahalakshmi is the authority to worldly pleasures and pursuits and takes you to the road not taken—the road of richness, prosperity and divine wealth as well.