Explanation:
The Indus Valley Civilization, also known as the Harappan Civilization, flourished around 2500 BCE to 1900 BCE in the region of the Indian subcontinent. It was one of the most advanced and prosperous ancient civilizations, known for its urban planning, sophisticated drainage systems, and advanced craftsmanship.

Jewellery in the Indus Valley Civilization:
The people of the Indus Valley Civilization had a rich tradition of making and wearing jewellery. They used various materials to create intricate ornaments, which were not only worn for aesthetic purposes but also as symbols of social status and identity.

Materials used:
The materials commonly used for making jewellery in the Indus Valley Civilization included:

a) Gold: Gold was a popular material used for making jewellery. Gold ornaments, such as necklaces, bracelets, earrings, and rings, have been found in archaeological excavations at various Indus Valley sites.

b) Copper: Copper was widely used in the Indus Valley Civilization for making various objects, including jewellery. Copper ornaments, such as bangles and beads, have been found in abundance at Indus Valley sites.

c) Silver: Silver was also used for making jewellery in the Indus Valley Civilization. Silver ornaments, such as anklets and amulets, have been discovered during excavations.

Platinum:
Platinum, however, was not used for making jewellery in the Indus Valley Civilization. Platinum was not known or utilized by ancient civilizations, including the Indus Valley Civilization. It wasn't until much later in history, during the Spanish conquest of the Americas in the 16th century, that platinum was discovered and recognized as a precious metal.

In conclusion, while gold, copper, and silver were widely used for making jewellery in the Indus Valley Civilization, platinum was not utilized during that time. Platinum only gained recognition as a valuable material much later in history.