Thank you for sharing this. It looks like Grace is wearing a scorpion brooch - do you know when this was taken? I'm thinking this was an occasion when famous scorpions got together; mentioned in several of Grace's biographies
You are most welcome. Again, browse through that website "Too Much Grace Kelly" whose link I shared above. Simply fascinating collection of photos. I wonder if its owner is a member of the Forums.
That scorpion-themed event was Princess Grace's 40th bday party/extravaganza where she invited fellow Scorpios. Richard Burton was a Scorpio, and naturally Elizabeth Taylor who he was married to at that time was invited.
As for the photo above, I am not sure though if this was taken during that time. I read that there are two main events -- the birthday party held at the Hotel Hermitage and a brunch party the next day held at the Palace Gardens. The picture above does not resemble either venue though.