Scutelleridae is a family of true bugs. They are commonly known as jewel bugs or metallic shield bugs due to their often brilliant coloration. They are also known as shield-backed bugs due to the enlargement of the thoracic scutellum into a continuous shield over the abdomen and wings. Wikipedia
Known as Rainbow shield bug or shield-backed bug https://commons.wikimedia.org/wiki/File:Rainbow_Shield_Bug_on_Jatropha_leaf.jpg
Spotted at Choa Chu Kang Park