What is the symbolism of the necklace Kiyoshi gives to Kimiko in the book, Tales From the Cafe?

The necklace that Kiyoshi gives to Kimiko is symbolic of reconciliation. He gives her the necklace for a belated birthday present, desperate to make amends 30 years following her tragic death. The necklace is representative of his ongoing love for Kimiko, and his desperate desire to set their relationship right.