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Warning: This post contains spoilers for Season 4 of The Crown.
It's been almost four decades since the world first laid eyes on Princess Diana's engagement ring.
In February 1981, 19-year-old Diana and 32-year-old Prince Charles stepped out to announce their engagement while giving reporters a glimpse of the 12-carat Ceylon sapphire ring.
Since then, it's gone on to become one of the most recognisable engagement rings in the world, inspiring countless replicas.
The famous ring recently featured on the fourth season of The Crown, where Princess Diana is shown picking out the ring while her future husband and mother-in-law, the queen, watch on.
Watch the trailer for Netflix's The Crown Season Four. Post continues below.
But exactly how accurate is The Crown's portrayal? Here's the true story behind Princess Diana’s ring.