Sea glass ohajiki jewellery. Ohajiki are game pieces, similar to a game called Tiddlywinks.
OHAJIKI:Ohajiki (おはじき) is a traditional Japanese children's game similar to marbles, but flat in shape. It is played with small coin-shaped pieces also called 'ohajiki'. The pieces are typically made of glass or plastic, although historically the game was often played with pebbles or go stones. The game became popular as an indoor game for girls during the Edo period.
These ohajiki are from Miyazaki and Fukuoka, Japan and found by a beach comber friend.