The Singapore Diamond Investment Exchange (SDIX) has launched a new investment-grade, standardized diamond product to rival gold as a safe-haven asset.
Higher purchases by India, the world's second-biggest consumer, could lend support to global prices that are trading near their highest level in a week.
Freeport agreed in August to divest a 51% stake in Grasberg to local interests in return for full operational control until 2041 plus fiscal and legal guarantees, but a final deal has still to be reached.