Known. A bead necklace from Mohenjo-daro has gold caps on its beads.
The page describes a necklace about 5,000 years old, made of steatite and gold beads, all capped in gold, with pendants of agate and jade. The picture caption calls it a beaded necklace of the Indus Valley, from Mohenjo-daro, about 2600 to 1900 BC. It is shown at the National Museum in Delhi, in a display of old ornaments.
The page does not say what is still argued.