During the ruckus as the Kaginoji house, Nasa and Tsukasa pledge their love to each other at a church. After Nasa reports to Kaname that he has finally proposed, she points that he still doesn't have a ring. Although he doesn't take much notice at first, Nasa gradually becomes more self-consciousness about the role of a ring in newlywed life.
But a diamond is 
once-in-lifetime purchase!
!لكنّ الألماس هو شيءٌ نشتريه مرّة في العمر
A-Aber Diamanten sind für die Ewigkeit!
Ma un diamante è un acquisto
 che fai una volta nella vita!
Mas um diamante é algo único na vida!
Так ведь бриллианты берут на всю жизнь!