Duleep Singh still kept his ropes and ropes of natural pearls, one of the possessions of the Maharajah of Lahore, even after the Kohinoor diamond was (doubtless forcibly) gifted to Queen Victoria. There are both pictures and portraits of him as an adult wearing them.
There were no cultured pearls in the 19th century, so his pearls would either have come from Ceylon, or more likely, from the Gulf states, the home of then most prized “Basra Pearls”. Basra pearls were obtained by enslaved Africans. The Ceylonese pearl industry was equally exploitative.
They might be the worthier victims who have deserve your sympathy and empathy in this true history? As another poster said in relation to diamonds, almost all natural jewels come from historical and current practices of exploitation of people/pollution/ destruction of the environment, habitats, villages/ countries of conflict. The same is true of other jewels too, including those that Duleep Singh retained. It’s impossible now, surely, to unpick the situations through which they ended up with their present holders?