My thoughts:
- The jeweller in the video is not Boucheron. Boucheron make a big song and dance about being on the corner of the Place Vendome because that's where 'the diamonds shine the brightest'. The view from that window is not the Place Vendome. (that's not to say they don't have workshops elsewhere, but if you were doing a publicity piece wouldn't you shoot it in your much hyped headquarters?)
Also, I found it quite funny that the woman using the polishing wheel not only had clean hands but a perfect manicure lol.
- I don't think the Monegasque Council would give a present featuring emeralds. The whole wedding was a massive PR event for the principality and there was a big emphasis on Grace wearing the national colours.
- I don't quite understand Ursula's story. If Grace didn't like the style then why give the present to Cartier to remount? Why not give it back to the original jeweller? Unless Grace preferred Cartier given that they made her engagement ring. Maybe that's why the original jewellers sued, I would if someone hand't paid for something then dismantled it elsewhere.
- No idea about the necklace at the Red Cross Ball in 1956. I thought it might be the bracelet converted into a necklace but it doesn't taper at the back as you'd expect.
As for Clerc & Co, I can't find any record of them but I am currently down a Monegasque jewelled rabbit hole so maybe something will turn up.
Sam x

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Below I posted some clippings which showed that, in late 1956, the National Council of Monaco was in dispute with the Parisian jewellery firm, Clerc, over payment for a necklace (described as a diamond necklace) for Princess Grace on her marriage to Prince Rainier.
I cannot find how this dispute was resolved, but it was still a matter of press reports in early 1957.
According to some press reports it was Princess Grace who rejected the jewel as not to her taste, and another was ordered. According to some press reports this was an emerald and diamond necklace.
Does any one have any reliable evidence as to what the National Council of Monaco gave the Princess?
On the Royal Magazin site Ursula has this entry
https://royal-magazin.de/monaco/grace-monaco-boucheron-wedding-gift-ruby-parure.htm Ursula says that the ruby and diamond suite was by Boucheron.
However, although the video which I found through Ursula's research does show that a ruby and diamond suite was ordered, it does not state that the jewellers concerned were Boucheron.
Could it be that this was the suite ordered by the National Council from Clerc?
Apart from the video there is press information that the National Council had ordered a ruby and diamond suite as a wedding gift for Princess Grace. Below are two.
Some press reports state that it was Princess Grace who rejected this suite. What ever the situation, the reports about the legal dispute attest to the fact that a second jewel was ordered in place of the first choice.
Some of the UK press reported that, for the Red Cross Gala in 1956, the Princess wore an emerald and diamond necklace, which was the gift of the citizens of Monaco. Was this the gift of the National Council? Or something else?
Below are photos of Princess Grace at the Red Cross gala. She is wearing a necklace which I don't recognise.
Has any one got any information?