Understanding Vocabulary: 'Trinket'

In the bustling village of Brookvale, children often gathered at the town square to play games. One crisp autumn day, the air was filled with laughter as the kids enjoyed themselves. Suddenly, a little girl named Mia noticed something strange at the old oak tree. It was an unusual, shimmering object hidden among the fallen leaves. Intrigued, she called her friends to come and see. “It looks like a treasure!” she exclaimed with a sparkle in her eyes. The children debated whether Mia's find was indeed a treasure or just another trinket left by someone long ago.

In this context, what does the word 'trinket' most closely mean?