Following the Paris car crash that killed Diana in 1997, the brothers picked out special objects of hers at Kensington Palace. The sapphire caught Harry's eye, and he took possession of it – though the brothers reportedly agreed that whoever got engaged first would use it.
The ring holds immense meaning for both men, who clearly dismiss any notion that it might be cursed in some way, given the collapse of their parents' marriage and their mother's untimely death.
Still, some feel the ring might be symbolically burdened with the weight of the past, and that perhaps a fresh start would have been more appropriate.
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Reporting by SIMON PERRY