Honestly, I don't know. I tried to find other pictorial examples of that necklace and link it with a name, but no such luck so far. Origins of this necklace are also unknown.
The Diana's Jewels website labeled it as "Graduated Diamond Flower Cluster Necklace."
--Previous Message-- : Diana wore many more diamond necklaces than I : remember from the time. What is the one : she's wearing while holding the bouquet? : : : :