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Re: QEQM at the Royal Variety Performance in 1968 ...second riviere pearls or diamonds
I agree, the shorter necklace looks like a string of pearls in the Shutterstock image, but that's a matter of light and reflection. Here's another photo from the same occasion which also gives a better view of the brooch: not the Duchess of Teck's flower brooch, but Queen Victoria's diamond fringe brooch.