The correct option is Iron.
Explanation
The Indus Valley Civilization (IVC) was a Bronze Age civilization that flourished approximately between 2600 BCE and 1900 BCE. The material culture of this period is characterized by the use of stone, shell, clay, and metals such as copper, bronze, gold, and silver. The technology for iron smelting was not developed during this era.
Analysis of Options:
- Iron Iron: Correct. Iron was not known to the Harappan people. The Iron Age in the Indian subcontinent emerged much later, typically associated with the Painted Grey Ware (PGW) culture during the later Vedic period (c. 1000 BCE). Therefore, iron beads are not found in Harappan sites.
- Jasper Jasper: Incorrect. Jasper is a semi-precious stone that was extensively used by Harappan craftsmen. Bead-making factories at sites like Chanhudaro and Lothal have yielded numerous finished and unfinished beads made of jasper.
- Lapis Lazuli Lapis Lazuli: Incorrect. This is a distinct blue semi-precious stone that was highly valued. It was used for making beads and was likely imported from regions such as Shortughai in present-day Afghanistan.
- Faience Faience: Incorrect. Faience is a synthetic material produced by fusing silica (sand or quartz) with a gum and coloring agent, then firing it. It was widely used in the IVC for crafting beads, bangles, and small vessels.
Key Takeaway:
The Indus Valley Civilization is strictly a Bronze Age culture; its inhabitants utilized copper and bronze but were completely unaware of iron.