The kerosang/kerongsang is a set of 3 brooches used by the Peranakan Straits Chinese ‘nyonyas’ to fasten kebaya/baju panjang. Usually consist of either three identical circular brooches connected with chains.
 
Motif: butterfly with faceted stone like intan.
Claw set stone, not glued.

Each kerosang measure about 3 x 5.5cm
Each link chain measures approx 13cm long.