The Williamson pink diamond is a flawless stone discovered at the Williamson Diamond mine in 1947. The owner of the mine gave the uncut stone to Princess Elizabeth & Prince Philip upon their wedding.  The 54.5 carat rough diamond was cut in 1948; Cartier was commissioned to create a setting for the main 23.6 carat round brilliant cut pink diamond. It became the centre of a flower brooch with five white diamond petals, marquise diamonds for leaves & white baguette cut diamonds for the stalk.
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