This ring came from a John Donald Collection and looks unworn
Back in the day, John Donald was Princess Margaret ( the late Queen's sister) favourite jeweller.
And if you were to say that it is a ring fit for a princess, you would be correct.
The quality and cut and setting of the diamonds is beyond excellent. 
There are 5 , 3mm diameter brilliant cut diamonds , approximately 0.75 ct 
Set in 18ct gold
Marked JAD
Assay marks for London 2003.
Weight 3.14 gms