Ketu Planet Yantra in Silver locket to appease the planet Ketu.
Ketu is a Malefic Planet. The Ketu Yantra engraved on Bhoj Patra is inside the locket to prevent the Bhoj Patra from damage. What is shown on the outer side is a printed version of the Ketu Yantra. The locket pendant is made of silver and the front has an acrylic sheet.