How big should be a diamond which makes women happier

Researchers led by Christopher Hsee from the University of Chicago conducted a survey of 136 students of one of the big universities in the coastal part of East China with a view to establish which size of diamonds delivers them the greatest joy, according to the Belgian Express Magazine.
The participants in the study were divided into two groups: one included girls from wealthy families while the other girls from families with low incomes. All of them were united in pairs.
The second group of participants was shown two diamonds - one had 3.0 mm in diameter, the second - 4.4 mm. Not knowing their size, the students were asked to give an emotional assessment of jewels after their inspection.
The students were asked if they could wear a ring with a diamond of this size, expressing their feelings on an 18-point scale graded from "very dissatisfied" to "very happy".
In turn, the research group involving the children of wealthy parents was invited to evaluate in a similar manner diamonds of 5.8 mm and 7.2 mm in size.
According to the results of the study, in both of the two groups the greatest degree of happiness was expressed with regard to the largest stones. The group of rich students given a 7.2 mm diamond had the same degree of happiness as the girls who got the 4.4 mm stone.
The researchers concluded that for women it was not the absolute size of a diamond which was important, but its size compared to other diamonds.
 
Alex Shishlo, Editor in Chief of the European Bureau, Rough&Polished