What do you mean buried? As in shovel, dirt, ashes to ashes? And if so, have they been recovered? NUTS I tell you, absolutely certifiable.
Unfortunately, I actually read that book by Simone Simmons and IIRC, and I'm 99.9% sure that I do - it was an amethyst said by Simmons to have recently been given to Diana by an admirer for Diana to make a piece of jewellery with.
Whether or not it is true, (and there's plenty of room for doubt, here, to say the least), Simmons
never said it was the Saudi sapphire and the other events surrounding the stone as Simmons described them would categorically rule that particular sapphire out.
On the other hand, the Princess did have a mischievous side to her, and if it were an amethyst and she disliked the donor, I don't think it's impossible that she did what Simmons alleges. Some amethysts are very inexpensive and in Paul Burrell's book, he writes about the Princess asking his younger son to wash her crystals at the Burrell's home. Crystals, mind you,
not precious stones!
On a more serious note, does anyone here know the provenance and also what became of the glorious opal centred six-strand choker Diana wore to the State Opening of Parliament in 1981? (It's the same one she was famously photographed sleeping in, when she wore the off-the-shoulder Bellville Sassoon "fairy tale" gown the night before her pregnancy with William was announced.) I have never seen photos of her wearing it after 1981 and it did not go on the tours of Australia/New Zealand and Canada in 1983. Either Menkes or Fields had a line or two that it had been borrowed along with the matching bracelet, but they have each been wrong about other jewels and it seems strange that we know so little about it.
That choker was my favourite of all the necklaces the Princess ever wore and I would have loved to see her in it much more. Any information will be much appreciated! Thank you!