Hi Sumit and Deep_blue,
The White Zircon / Diamond should be worn on the right hand little finger for males and on left hand little finger for females. White Zircon should not be worn on ring finger as ring finger is significator of SUN. And the rule of temporary friendship what you are conveying above is not considered more as its based on zodiac placements. And usually the friendship / enemy is been measured based on their degrees shared by each other.
GOD BLESS!!!!
Srinivasa Temkar