This is a Balinese gamelan ball! It's a charm that makes a shimmering sound when shaken. It's said to be an item inspired by the sound of gamelan, traditional Balinese music. It has a design that combines a green ball and an angel. Also known as a "dream ball," it's popular as a good luck charm for making wishes come true. It has a "925" stamp on the inside of the Vatican. Size comparison with a 500 yen coin in the fourth photo.