@dibberly
In terms of reparations… I have conflicting views. At this stage I don’t know because it’s a tangled web spanning about 180 years that needs careful excavation to untangle.
If Sikh royalty was still alive then it’s clear to me that they would be the obvious ones to be repatriated. The problem arises out of the death of Sikh royalty (and if you probe into it does look suspect). To me, it looks like Sikh royalty was ended on purpose (and there is some plausible evidence to back this claim up).
The loss of Sikh royalty is what has opened up claims for the other various countries you’ve mentioned. This an important starting point: Why has Sikh royalty ended? If there was foul play then shouldn’t that be addressed before other contenders to the diamond are considered?
I think the Koh-I-Noor wasn’t part of the Indian partition agreement in 1947/1948 because the diamond had more symbolic significance only to the Sikhs and Punjab at the time, not so much the rest of India or anywhere else. And at the time of partition, members of Sikh royalty were still alive (but anything the last few members were saying were being ignored because their royal line was at death’s door, they were vulnerable and they’d lost influence).
At partition in 1947 the Koh-I-Noor would have clearly have been strongly associated with Ranjit Singh and his son Duleep Singh (the tragic story of the ten year old Sikh Maharajah who signed the Koh-I-Noor away is well woven into the fabric).
The Punjab was partitioned. That created Pakistan as a new country (including Lahore that had been the capital of Ranjit Singh’s kingdom). Ranjit Singh’s granddaughter was dead against partitioning the Punjab (it means land of five rivers, so it’s better kept united). Partition was also ugly and tragic for the people divided by religious violence (in contrast to the religious unity and peace that Ranjit Singh had built). So the granddaughter was in the right to speak up in protest.
William Dalrymple’s research has found it was the founder of the Sikh Empire, Ranjit Singh, who prized the Koh-I-Noor like no other owner before him or after. The Koh-I-Noor was used to symbolise his empire (which others, including the British, were both admirable of and envious). To take the Koh-I-Noor was like taking the Sikh battle standard colours; it was a symbolic gesture of “winning” the Sikh empire and the Punjab (but the British victories were always contested by Duleep Singh’s mother on grounds of breached treaties, invasion, injustice and treachery etc).
It’s clear to me that the Sikhs have the greatest claim to the Koh-I-Noor and are the ones who deserve repatriation (their losses are arguably the heaviest - and that’s also through being the martial race to have assisted the British in various wars in 1857, WW1, WW2 etc.). The problem is that the Sikhs no longer have a royal family to receive the Koh-I-Noor and restore sovereignty or even their own land (the Punjab) as a country in their own right (and it’s unlikely they’ll ever get their own sovereign state back again. Once it was lost is was lost for good…).
Sikhs have the best claim to ownership of the diamond. But I would sincerely be concerned for Sikh and Punjabi welfare and safety if they were given the Koh-I-Noor. There would be too much jealousy and envy - unless there was education about the tapestry and tangled web of history (and I don’t see that education happening willingly).
A consultation with all claiming parties would be an option. A Solomonic wisdom may be needed… but consultation would be a step towards trying.
Before consultation though, Britain would have to atone in some way. And definitely remove the Koh-I-Noor from their crown (because it’s not lawfully theirs and bring the sanctity of the crown into disrepute).
King Charles III, may ye take heed and tread this Koh-I-Noor tightrope cautiously, justly and compassionately.