As gemstones found by a British landowner in colonial India head to Sotheby's, academics say it furthers "colonial legacies of violence."

Art historian Naman Ahuja says the Piprahwa gems are "the cultural property of the world." But soon they'll be the legal property of the highest bidder.

The postponement, which Sotheby’s said was agreed to by the sellers, will “allow for discussions between the parties,” the statement added. The collection of “gem relics” — including amethysts,