Little Mo is right. These are amethysts and diamonds in Princess Diana's pair of earrings.
Here's the pictures from my collection. Diana either wore deep red velvet gowns or purple gowns while wearing these amethyst and diamond (or beads) earrings, bracelets or chokers.
--Previous Message-- : Nellie - your second row of photos are : actually cabochon amethysts. She is wearing : them with gowns that have or are purple. : : --Previous Message-- : : These are pics I collected way back. : These are pairs of the sapphires, in about : three arrangements. : : : : : : : --Previous Message-- : Certainly. Please let me know your thoughts : about the veracity of this information. : : : : : http://www.dailymail.co.uk/news/article-2260655/Kate-Middleton-Rotten-official-portrait-Duchess-Cambridge-artist-Paul-Emsley-unveiled.html : : : : : : : :