Explanation: Indus Valley Civilisation:

• Materials from the subcontinent and beyond
• The Harappans procured materials for craft production in various ways.
• Nageshwar and Balakot areas were famous for shells.
• Lothal which was near sources of carnelian (from Bharuch in Gujarat), steatite (from south Rajasthan and north Gujarat) and metal (from Rajasthan).
• Another strategy for procuring raw materials may have been to send expeditions to areas such as the Khetri region of Rajasthan (for copper) and south India (for gold).
• Sites such as Shortughai, in far-off Afghanistan, near the best source of lapis lazuli, a blue stone that was apparently very highly valued.

Source: Themes in Indian History