Princess Grace of Monaco’s personal Cartier collection from her corbeille de mariage, this grand necklace of brillant and baguette diamonds was a wedding gift to Princess Grace of Monaco from the "organismes monégasques". It was made by Cartier Paris in 1953 as a three-stranded diamond necklace in platinum.

Its relative simplicity was the mark of Cartier's precious jewelry of the 1950s, which was intended to complement the wearer rather than make a huge statemant. 

In the first row are set three round diamonds, in the 2nd row four huge round diamonds, and five large diamonds in the 3rd row, each dispersed amid geometric baguettes, making the necklace both delicate and architectural. It totalled a weight of 64ct. It is not wearable as tiara. 

The corbeille de mariage of the princess, or corbeille de noces, was a gift basket filled with luxury accessories that the intended was required by custom to offer Grace on the marriage. 

She was becoming a princess officially by her marriage to Monaco's Prince Rainier, who held 139 other titles and was absolute ruler of a 370-acre realm with 20,000 subjects.
She had to go through two weddings, separately required by the Napoleonic Code of Monaco and the laws of the Roman Catholic Church. She was Her Serene Highness, Princess Gracia Patricia of Monaco.

And so an old-style fairy tale came to its appropriately romantic conclusion, but only after a number of modern day variations and additions had come to pass.

The wedding presents ranged from the fabulous to the foolish. Among the more practical was a Rolls-Royce, among the less useful a gold and bone hatchet.

Her granddaughter Charlotte Casiraghi, wore the diamond necklace at the evening reception of her marriage on June 1th 2019, see above.