here I am giving you the ISBN-numbers for 2 books, I think you might like to read:
"Queens´Jewels" which shows Queen Mary and this graduated strand on pages 110 and 111, explanation that it was a gift to her son on page 112. It was written by Vincent Meylan and shows all the important pieces of queens in Europe, Russia and the Balkan. Lovely photos, interesting articles.
I bought it via Amazon, if anyone is interested here the ISBN-number: 284 323 364 X. It was printed in 2002.
"Famous Jewelry Collectors" by Stefano Papi & Alexandra Rhodes, ISBN 0-8109-3341-1. It is mostly about famous actresses, singers but also royal people. Ava Gardner is one of the ladies who loved pearls and there are some more. Interesting reading, beautiful photos!